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GENERAL SIGNAL RULES
243. When stopping at a signal displaying a Stop indication,
or a Stop-and-proceed indication, no part of the train or engine shall
pass the signal, and when ready to proceed, signal 14 (b) must be sounded.
244. In foggy or stormy weather trains and engines must
approach all signals with great care, prepared to respect the indication
given. If necessary, stop must be made to determine the indication.
245. When a train or engine has passed a signal permitting
it to proceed and is delayed in the block, it must proceed at restricted
speed to the next signal or to a point where track is seen to be clear
to the next signal.
246. After train or engine has passed a signal displaying
a proceed indication, the indication of the next signal may change to
Stop, and members of the crew must be on the alert to observe it.
247. Sand must not be used nor water allowed to run over the
movable parts of an interlocking, power operated switch or spring switch.
RULES GOVERNING THE MOVEMENT OF TRAINS
IN THE SAME DIRECTION BY BLOCK SIGNALS
251. On portions of the rail road, and on designated
tracks so specified in the time-table, trains will run with reference
to other trains in the same direction by block signals whose indications
will supersede the superiority of trains.
251 (A). The movement of trains will be supervised by
the train dispatcher. Oral and message instructions issued by him must
be complied with. When necessary to provide single track operation on
double track, or to move trains against the current of traffic, or for
operation of work trains, train order authority must be obtained.
253. The train dispatcher must be advised in advance
of any known condition that will delay the train or prevent it from making
usual speed.
254. Except as affected by Rules 251 and 251 (A), all
Block Signal Rules and Operating Rules remain in effect.
RULES GOVERNING OPPOSING AND FOLLOWING MOVEMENT OF TRAINS
BY BLOCK SIGNALS
261. On portions of the railroad, and on designated
tracks so specified in the time-table, trains will be governed by block
signals, whose indications will supersede the superiority of trains for
both opposing and following movements on the same track.
263. The train dispatcher must be advised in advance
of any known condition that will delay the train or prevent it from making
usual speed.
264. Except as affected by Rule 261, all
Block Signal Rules and Operating Rules remain
in effect.
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CENTRALIZED TRAFFIC CONTROL SYSTEM RULES
Note.—Centra1ized
Traffic Control System Rules will be used only in CTC territory specified
in the time-table or in Special Instructions.
265. Rules 261 to 264, inclusive, apply in CTC territory
and, except as affected by Rules 261 to 273, inclusive, all other Block
Signal Rules, Interlocking Rules and Operating Rules remain in effect.
266. Movement of trains and engines will be supervised
by the train dispatcher, who may also operate the CTC control machine.
When the CTC control machine is operated by other than the train dispatcher,
the train dispatcher will issue the necessary instructions to the control
operator.
267. When movement is entirely within CTC limits, sections
and extra trains may be authorized by clearance instead of by train order.
For example, clearance designating a section must read, "First 3
Green Signals", "Second 3 No Signals", and clearance designating
an extra train must read, "Extra 436 west".
Trains or engines must not enter CTC territory unless the governing signal
displays a proceed indication or authority is obtained from the control
operator.
268. Trains or engines must not foul or enter the main
track or a controlled siding at hand operated switches not equipped with
electric locks without first obtaining authority from the control operator.
269. When a train or engine has been stopped by a Stop
indication, if no conflicting movement is evident, a member of the crew
must immediately communicate with the control operator, identify himself,
his train and location, and be governed by instructions received. The
instructions must be repeated by the employe receiving them to insure
correct understanding. Before proceeding, Rule 275 must be complied with.
When the train dispatcher knows there is no opposing train or engine movement
involved, he may authorize the train or engine to proceed in the following
form: "You may proceed at restricted speed to the next signa1".
If the train dispatcher does not positively know there is no opposing
train or engine movement involved, he may authorize the train or engine
to proceed in the following form: "You may proceed under flag protection
to the next clear or approach signal". When flagging from a Stop
signal, train must wait ten (10) minutes after flagman has started.
269 (A). When stopped by a Stop indication and communication
has failed, train or engine must not proceed, except when not standing
between Stop signals at a station, train or engine must move forward under
flag protection to a point where they will be between Stop signals at
a station, clearing main track when practicable, complying with Rule 275.
Further movement must not be made except on signal indication or until
authority is received from control operator.
270. If any part of a train or engine overruns a Stop
indication, front of train or engine must be protected immediately as
prescribed by Rule 99 and member of crew must communicate with control
operator and be governed by his instructions.
271. Within CTC limits, trains or engines may occupy
a track or tracks within specified limits and between specified times
to perform switching or other work when authorized to do so by the control
operator in the following form; " (train or engine) may use (track
or tracks) between _______ and _______ (or at____________) ______m until
______m”.
When requesting track and time limits, conductor will give his name,
location, train or engine number, and specify time and work limits and
track or tracks to be used. When such authority is granted, the instructions
must be repeated to the control operator. No movement may be made under
this rule until the engineer has received and understands the track and
time limits granted.
After the train or engine has entered the specified limits, the control
operator must block all signal and switch levers controlling movements
into the specified limits and must not permit any other train or engine
to enter the limits during the period track and time limits are in effect.
Blocks must not be removed until track and time limits have expired unless
conductor reports the train or engine clear of the track or tracks specified
or work completed.
During the period track and time limits are authorized, the track or tracks
specified may be used in either direction without Hag protection. This
does not modify requirements for proper observance of signal indications.
Trains and engines must be clear of the track or tracks specified or work
completed, switches restored to normal position before expiration of the
time specified, and control operator so advised. If not clear by the time
specified, protection must be provided as prescribed by Rule 99. If additional
time is required, authority must be secured from control operator before
previously authorized time expires.
When two or more trains or engines are given the same or overlapping
track and time limits, the control operator must inform the conductor
of each train or engine of the fact and such trains or engines must protect
against each other and move at restricted speed within such limits.
272. When an employe’s call light is illuminated,
any employe observing it, except those on moving trains, must immediately
communicate with the control operator.
273. When CTC operation is interrupted or suspended,
trains and engines must be governed by instructions from the control operator
or proper officer.
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DUAL CONTROL SWITCHES
275. When a train or engine is stopped by a signal governing
movement over a dual control switch, if no conflicting movement is evident,
a member of the crew must immediately communicate with the train dispatcher
or operator and be governed by his instructions. Such instructions must
include information as to the route to be used. The instructions must
be repeated to insure correct understanding.
When authorized to proceed, or when unable to communicate with the train
dispatcher or operator, movement must not be made until after selector
lever has been taken out of "power” position and placed in
"hand" position.
Hand throw lever must be operated until switch points are seen to move
with the movement of hand throw lever. Switch must then be lined for the
route to be used. Selector lever may be restored to “power"
position and locked as soon as leading wheels of engine or car have moved
onto the switch points.
275 (A). When necessary to perform switching over dual
control switch, the switch may be operated manually by a member of the
crew after authority to do so has been obtained from the train dispatcher
or operator. The period of time the switch may be used must be clearly
stated and understood.
Selector lever must be placed in “hand" position and left in
that position until all movements over the switch have been completed.
Hand throw lever must be operated until switch points are seen to move
with the movement of the hand throw lever. Indications of stop signals
governing movements over the switch may be considered suspended while
selector lever is in "hand" position, but movements must be
made at restricted speed.
After final movement has been made over the switch, selector lever must
be restored to "power" position, locked and train dispatcher
or operator notified.
ELECTRIC LOCKED SWITCHES
280. Instructions for operation of electric locks are
posted at or near electric lock and must be complied with.
281. When indication is received showing lock has released,
lock and switch may be operated and train or engine may proceed without
waiting three minutes as required by Rule 513.
282. Authority to use an electric locked switch which
is under control of the control operator, must be given verbally to member
of crew by control operator. The period of time the switch and track may
be used and designated limits must be clearly stated and understood.
283. Seal on emergency release of electric lock must
not be broken, or emergency release operated, without authority from the
train dispatcher or control operator, except when communication has failed.
When necessary to release electric lock by use of emergency release, and
movement is to be made to a main track, member of crew must wait three
(3) minutes after release has been operated before changing main track
switch. Train or engine may then proceed being governed by signal indication,
or where there is no signal, when preceded by a flagman to the next Clear
or Approach signal.
Train or engine must wait ten (10) minutes after flagman has started.
When release seal is broken, or found broken or missing, report must be
made promptly to the superintendent, and the control operator.
THE FOLLOWING RULES 300 (A) TO 373 (A) INCLUSIVE APPLY ONLY ON THE
C. M. St. P. & P. RAILROAD.
MANUAL BLOCK SYSTEM RULES AND FORMS
(To be used as designated in the time-table).
305. Block signals govern the use
of the blocks, but, unless otherwise provided, do not supersede the
superiority of trains nor dispense with the use or the observance of
other signals whenever and wherever they may be required.
306. When a block station is open
at an irregular hour, trains must be notified, when possible, by train
order.
307. A train having entered a block on other than
a proceed indication or Clearance Form A showing block “clear”
must not accept a proceed indication at any intermediate block station
which was closed when such train entered the block, without receiving
Clearance Form A.
308. When Clearance Form A is used
information will be shown as to condition of block "clear”
or “occupied”. If block is occupied, train will proceed
prepared to stop short of train ahead.
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OPERATORS
311. Signals must be kept in the
position displaying the most restrictive indication, except when displayed
for an immediate movement.
312. Appliances must be operated
carefully and only by those charged with that duty. If any irregularity
affecting their operation is detected the signals must be displayed
to give their most restrictive indication until repairs are made.
313. Operators must observe, as far
as practicable, whether the indications of the signals correspond with
the positions of the levers.
314. Operators must not make nor
permit any unauthorized repairs, alterations or additions to the apparatus.
Any defects in the appliances must be promptly reported to the superintendent.
315. A block record must be kept
at each block station on the prescribed form, beginning at 12:01 a.m.
daily, showing the time all trains enter and clear the block, communicating
code signals, and the time they are given and received.
316.
COMMUNICATING CODE
1.—Keep block signal in stop position for opposing train.
13.—I understand.
2.—Block clear.
5.—Block not clear of train other than passenger.
56.—Block not clear of passenger train.
38 —Opening block station. Answer by 2, 5 or 56.
39 —Closing block station, followed by 2.
If the block is clear, to be answered by 13, followed
by 2. If the block is not clear, to be answered by 5 or 56.
When two or more tracks are used in the same direction, operators in using
the communicating code must also specify the track.
Note.—When telephone is used, the code will be used without the
numerals.
317. On single track, to admit a
train to a block, the operator must examine the block record, and if
the block is clear of opposing trains and preceding passenger trains,
give "1 for ___” to the next block station in advance.
If it is proper for the train to be admitted, the operator in advance
will reply “2 for____” or “5 of _____.”. The
operator at the entrance of the block must then display the proper signal
in indication.
A train must not be admitted to a block which is occupied by an opposing
train or by a passenger train, except as provided in Rule 333 or by
train order. A train may be permitted to follow a train other than a
passenger train into a block under Clearance Form A, when so directed
by train dispatcher.
317 (A). To admit a train to a block
to meet opposing trains at a closed block station or a siding between
two open block stations, by train order, the operator must examine the
block record, and if the block is clear of all but the train or trains
to be met, give "1 for ____except ____”, to the next block
station in advance.
The operator receiving this signal, if there is no train in the block
except the train or trains to be met, must display Stop indication or
19 order indication and then reply “13 for ______except _____”.
The operator at the entrance of the block must then display Stop indication
or 19 order indication.
The approaching train will then be admitted to the block with a Clearance
Form A reading, "Block clear except ______Stop indication or 19
order indication is displayed for____ to meet ____as per order number
____”.
The authority of an operator for the issuance of such clearance will
be the receipt of a copy of the order to be repeated and signed by him
and completed by the train dispatcher.
317 (B). To admit a train awaiting
the arrival of an opposing train or trains to a block, the operator
must examine the block record and if the block is clear of all but the
expected train or trains, give “1 for _____except _____”
to the next block station in advance.
The operator receiving this signal, if the block is clear of all but
the train or trains to be met, must display Stop indication and then
reply "13 for _____ except ____”. The operator at the entrance
of the block must then display the proper signal indication.
The train must be brought to a stop and may then be given Clearance
Form A reading, "Block clear except . Stop indication is displayed
for ____ to meet ,”. A train receiving such clearance must not
leave until the opposing train has arrived.
317 (C). In case a train has left
an open block station expecting to reach the next open block station
for an opposing superior train and fails to do so, and there are one
or more closed block stations or sidings between the two open block
stations, the train dispatcher, after holding the superior train five
(5) minutes or more beyond its schedule leaving time or train order
waiting time, may authorize the release of the superior train with a
train order in the following form:
“______left _____at_____ and has not arrived at ________Operator
___________ will
release No ____.”. Clearance Form A will then be issued reading:
"Block clear except _____ Stop indication is displayed for Order
No ____”.
318. On double or three or more tracks
to admit a train to a block, the operator must examine the block record,
and display proper signal indication.
A train must not be admitted to a block which is occupied by a passenger
train, except as provided in Rule 333 or by train order.
A train may be permitted to follow a train other than a passenger train
into a block under Clearance Form A when so directed by the train dispatcher.
319. When a train enters a block,
the operator must give train number and time to the next block station
in advance. When the rear of the train has passed 250 feet beyond the
block signal, he must give the record of the train to the next block
station in the rear. This information must be entered on the block records.
319 (A). When a train, other than
a passenger or a mixed train, is inside the outer switches at certain
block stations indicated by time-table or special instructions, it may
be reported as arrived provided the operator has seen the markers or
is notified by the conductor that all of his train is inside the switches.
Following trains may be given a proceed indication or a Clearance Form
A showing block “clear”, except that if a first class train
is to enter the block it must have a train order and a Clearance Form
A showing block “occupied”. Trains, other than first class
trains accepting and moving under proceed indication or Clearance Form
A showing block "clear”, must approach the designated station
at restricted speed.
320. Unless otherwise provided, operators
must not ask for the block until they have received a report of the
train from the next block station in the rear.
321. Operators must, as far as practicable,
observe all passing trains and note whether they are complete and in
order, and the markers properly displayed.
322. Should a train pass a block
station with any indication of conditions endangering the train, or
a train on another track, the operator must immediately notify the operator
at the next block station in advance, and each must display Stop indications
to all trains that may be affected, and must not permit any train to
proceed until it is known that its track is not obstructed.
325. An operator informed of any obstruction in a
block must immediately notify the operator at the other end of the block
and each must display Stop indications to all trains that may be affected
and must not permit any train to proceed until it is known that its
track is not obstructed.
326. When a train or engine takes
siding or otherwise clears the main track the operator must know that
it is clear of the block before giving "2" or displaying a
Clear indication for that block.
The operator must obtain control of the block before permitting a train
or engine to re-enter the block.
327. To permit a train or engine
to enter a block or foul the main track, or to cross from one main track
to another, the operator must examine the block record, and if all the
blocks affected are clear of approaching trains he must provide or arrange
for block protection before permission is given, and until movement
is completed and the block clear, trains will not be admitted to the
block except under Clearance Form A.
All cross-over movements must be entered on the block record.
328. When coupled trains are separated,
as prescribed by Rule 364, the operator must regard each portion as
an independent train.
329. When necessary to stop a train
for which other than a Stop indication has been displayed and accepted,
the operator must give hand signals in addition to displaying the Stop
indication.
333. When, from any cause, an operator
is unable to communicate with the next block station in advance, he
must stop all trains approaching in that direction. Should no cause
for detaining a train be known, it may then be permitted to proceed
with Clearance Form A, provided ten (10) minutes have elapsed since
the passage of the last preceding train.
334. Hand signals must not be used
when the proper indication can be displayed by the block signals, except
as prescribed by Rule 329 or 343. When hand signals are necessary they
must be given from such a place and in such a way that there can be
no misunderstanding as to the signals, or as to the train or-engine
for which they are intended.
Note.—Hand
signalling includes the use of flag, light, torpedo and fusee signals.
335. Block signals for a track apply
only to trains moving with the current of traffic on that track. Operators
will use train order or home signal for blocking trains moving against
the current of traffic.
336. Operators are responsible for
the care of the block station, lamps and supplies; and, unless otherwise
provided, of the signal apparatus.
337. Lights in block stations must
be so placed that they cannot be seen from approaching trains.
339. If a Stop indication is disregarded,
the fact must be reported to the next block station in advance and then
to train dispatcher.
340. To open a block station, the
operator must give “38” to the next block station in each
direction and record the trains that are in the extended block.
When trains, which were in the extended block when the block station
was opened and which had passed his block station before it was opened,
clear the block in advance he must repeat the record to the block station
in the rear.
341. A block station must not be
closed except upon authority of train dispatcher.
342. Unless otherwise provided, a
block station must not be closed until the block in each direction is
clear of all trains.
To close a block station, the operator must give “39” followed
by “2” to the next block station in each direction and when
he receives “13” followed by "2” enter it on
his block record, with the time it is received from each block station.
The block signals must then be secured in the proceed position, all
lights extinguished, and the block wires and, when necessary, circuits
arranged to work through the closed block station.
343. When a block station is open
at an irregular hour, operators must use hand signals, in addition to
block signals, to give the required indications until all trains have
passed which have not been notified by train order that the block station
is open.
343 (A). When weather conditions
obscure the view, operators will promptly report to the train dispatcher,
who will decide if an absolute block of all trains must be maintained.
344. Operators must not permit unauthorized
persons to enter the block station.
ENGINE AND TRAIN CREWS
361. Block signals for a track apply
only to trains moving with the current of traffic on that track. A Train
order or home signal will be used for blocking trains moving against
the current of traffic.
362. Trains must not pass a Stop
indication or 19 order indication without receiving Clearance Form A.
362 ( A ). Where train order signal
is also used as block signal, a train may pass such signal at Stop indication
or 19 order indication to make a station stop, to take fuel or water,
or to enter the siding in advance of the signal, provided the track
is known to be clear, and under protection as prescribed by Rule 99.
363. Trains must not proceed on hand
signals as against block signals.
364. Unless otherwise directed, when
two or more trains have been coupled and so move past any block station,
they must be separated only at a block station and the operator notified.
365. When a train or engine takes siding or otherwise clears the main
track, unless the switch involved is operated by the operator, conductor
or engineer must so report to the operator. A train or engine must not
enter a block or foul the main track, or cross from one main track to
another, without permission of the operator.
A train or engine having passed beyond the limits of a block must not
back into that block without permission of the operator.
365 (A). Trains must not go to a
closed block station or a siding between two open block stations to
meet a train or trains without a train order, and in addition will receive
Clearance Form A at the nearest open block station reading, “Block
clear except______ Stop indication or 19 order indication is displayed
for____to meet _____ as per Order No_____”.
365 (B). Trains must not go to a
closed block station or a siding between two open block stations to
be passed by other trains without a train order.
365 (C). To permit a train to go
to a closed block station or a siding between two open {block stations
to be passed by other trains, the following form of train order must
be used:
"No ______ may enter the block at _______ ahead of No .______”.
The trains receiving this order will run according to the rules
365 (D). When a train is passed
by another train at a closed block station or a siding between two open
block stations, it may, after waiting ten (10) minutes, proceed on its
right or schedule, prepared to stop short of train ahead.
370. When there is an obstruction
between block stations, notice must be given to the nearest operator.
371. When a train is stopped by a
home or block signal, the conductor or engineer must, when practicable,
immediately ascertain the cause.
372. Conductors must report to superintendent
any unusual detention at block stations.
373. A block station must not be
considered as closed, except as provided for by time-table or special
instructions.
373 (A). When a train receives a
Clearance Form A filled out as shown in Rule 317 (B), it must not leave
that station before the opposing train mentioned in the clearance has
arrived.
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RAILROAD RADIO RULES
General
The following rules and requirements cover use of railroad
radio systems, and govern employes using such systems.
400 (A). DEFINITIONS A Railroad Radio
Communication System is one employing radio for the transmission of
intelligence between moving equipment, between moving equipment and
a fixed point, or between fixed points.
400 (B). Radio communication systems
are under the jurisdiction of the Federal Communications Commission.
The Railroad Company and its employes are governed by the Commission’s
Operating Rules. Violation is a Federal offense for which severe penalties
are provided.
400 (C). In order to operate a radio
transmitting set, a railroad employe must read and study the following
rules and pass an examination thereon. Such examinations will be given
by railroad examiners. Operating Rules ‘
401. All employes, except those specifically
authorized to do so, are prohibited from making any adjustments to a
railroad radio set. Employes so authorized must carry their FCC operating
license or verification card when on duty. If it appears that a radio
transmitter is not operating properly, its use shall be discontinued
and the superintendent notified as soon as possible.
402. No employe shall knowingly transmit
any false distress communication, any unnecessary, irrelevant or unidentified
communication, nor utter any obscene, indecent or profane language via
radio.
403. No employe shall divulge or publish
the existence, contents, purport, effect or meaning of any communication,
(distress communications excluded), except to the person for whom the
communication is intended, or to another employe of the railroad whose
duties may require knowledge of the communication, The above applies
either to communications received direct or to any that may be intercepted.
404. Before transmitting, any employe
operating a radio transmitting set shall listen a sufficient interval
to be sure that the circuit is not already in use, particularly for
distress traffic.
405. A distress call will be preceded
by the word “Emergency" repeated three times. Such calls
shall be used only to cover initial reports of derailments, storms,
washouts, fires, obstructions to tracks, or other matters which would
cause serious delay to traffic, damage to property, injury to employes
or the traveling public, and shall contain as complete information thereon
as possible. All employes shall give absolute priority to communications
from another station in distress, and except in answering or aiding
a station in distress shall refrain from sending any communications
until there is assurance that no interference will result to the station
in distress.
406. The Railroad Company is required
to answer an official notice of violation of the terms of the Communications
Act of 1934, as amended, within three days from receipt of notice, and
any employe receiving inquiry concerning any violation shall answer
such inquiry within 24 hours after receipt of notice.
407. Any employe shall permit inspection
of the radio equipment in his charge and all FCC documents pertaining
thereto, by a duly accredited representative of the Federal Communications
Commission at any reasonable time.
408. Employes, except in yard operation, shall identify
the radio station from which they are calling by prefacing their call
with the railroad name, for example:
"ABC (Railroad) caboose train 92 calling engine";
"XYZ (Railroad) caboose train 92 calling
engine train 89";
"Main (Railroad) engine 547 calling caboose 1402".
408 (A). Employes in yard operation shall
identify the radio station from which they are calling by prefacing
their call with the railroad name, for example:
"ABC (Railroad) Yardmaster calling ABC
(Railroad) engine 547"; .
“ABC (Railroad) engine 492 calling ABC
(Railroad) Yardmaster Dover (Station)";
“ABC (Railroad) engine 492 calling ABC (Railroad) engine 547";
etc.
409. In certain cases at crossings, junctions,
or paralleling tracks, some interference may develop with another railroad.
In such cases, especial care in making identification shall be used,
and the employes concerned shall cooperate in handling their business
by alternating calls and being as brief as possible.
410. If any communication from a station
other than another railroad radio station interferes with railroad radio
service, the railroad employe shall endeavor to ascertain the identity
of such station, and report the occurrence as soon as possible through
authorized channels, to the superintendent, giving the exact time, nature
of the communication and identity of the station, if possible.
Internationally, the word “MAYDAY" indicates a distress message,
the word "PAN" an urgent message, and the word "SECURITY”
a safety message. Railroad employes may hear such messages sent by aircraft,
or, in coastal areas, by boats. Railroad employes hearing such messages
must report them immediately through authorized channels to the superintendent,
in addition to taking such appropriate action to relieve the distress
as may be possible.
411. When hand signals cannot be given
and radio is used in connection with switching movements, specific instructions
as to movement must be given. For example: "Engine 547 back up
5 car lengths" rather than "Back up".
In case of radio failure, or if radio contact is interrupted, movement
must be stopped at once. Further movement must not be made until communication
is made by words, or radio contact is restored.
412. Information that a train to be met
or passed is in clear on siding must not be transmitted from head to
rear end of train unless positive identification of the train to be
met or passed has been made.
413. Train orders must not be transmitted
by radio between head and rear end of train.
Note.-Conversation between head and rear and of train relative to fulfillment
of train orders in their possession is permitted.
414. Information must not be passed between
head and rear end of train as to indication of train order signals.
Employes on trains must not ask and employes at stations must not advise
the indication of any train order signal or other Fixed signal, nor
the contents of any train orders affecting their train or any other
train.
415. Except in emergency, or where specifically
authorized, radio must not be used by the train dispatcher in the transmission
of train orders. When so used, the rules covering train orders transmitted
by telephone must be complied with.
416. Railroad radio must not be used
for transmitting when located less than 250 feet from the scene of blasting
operations, account hazard of detonating dynamite charge where electric
caps are used.
The train dispatcher will, upon advice from the foreman in charge, notify
all trains operating in that territory the location of such blast- ing
operations.
417. When using railroad radio there
may be times when employes are not able to contact, or get response
from another train or wayside station. If necessary to transmit important
in- formation, it should be transmitted regardless of whether or not
an acknowledgment is received. When such information is transmitted,
and no acknowledgment is received, necessary action must be taken based
on the belief that the information was not received.
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