Abbreviations included in parentheses are
authorized for use in Timetables, Bulletin Orders, and Form D’s.
ABSOLUTE BLOCK: A block that must not be
occupied by more than one train.
AUTOMATIC BLOCK SIGNAL: A block signal
that is activated either by track circuit or in conjunction with
interlocking or controlled point circuits. This block signal
automatically indicates track condition and block occupancy.
AUTOMATIC BLOCK SIGNAL SYSTEM (ABS): A
block signal system in which the use of each block is governed by an
automatic block signal, cab signal, or both.
AUTOMATIC TRAIN STOP (ATS): A device on
an engine which will cause a penalty application of the brakes if the
engineer fails to acknowledge a cab signal change to a more
BLOCK: A length of track with definite
limits on which train movements are governed by block signals, cab
signals, or Form D.
BLOCK SIGNAL: A fixed signal displayed to
trains at the entrance of a block to govern use of that block.
BLOCKING DEVICE: A lever, plug, ring, or
other method of control, that restricts the operation of a switch or
BLOCKING DEVICE APPLIED (BDA)
BLOCKING DEVICE REMOVED (BDR)
BLUE SIGNAL: A clearly distinguishable
blue flag, blue light or blue tag by day, or a blue light or blue tag
by night. When displayed, it signifies that workers are on, under or
BOLT-LOCK SWITCH: A hand-operated switch
equipped with a pipe connected locking device that is designed to
shunt the signal system before the switch points are operated.
BULLETIN ORDER (BO): A publication used
to notify employees of changes to rules, procedures, or other
instructions affecting the movement of trains. Bulletin Orders are
issued periodically by the designated officer.
CAB SIGNAL: A signal that is located in
the engine control compartment. It indicates track occupancy or
condition. The cab signal is used in conjunction with interlocking
signals and with or in lieu of block signals.
CAB SIGNAL SYSTEM (CSS)
CAMP CAR: Any on-track vehicle, except a
wreck train, that is used to house railroad employees.
CAR SHOP REPAIR TRACK AREA: One or more
tracks within an area in which the testing, servicing, repairing,
inspecting, or rebuilding of cars is under the exclusive control of
mechanical department personnel.
CONDUCTOR and ENGINEER (C&E)
CONTROL STATION: The Dispatcher’s office
or the location where the Operator is on duty, from which remote
control signal appliances or switches are operated.
CONTROLLED POINT (CP): A station
designated in the Timetable where signals are remotely controlled from
the control station.
CONTROLLED SIDING (CS): A circuited
siding in which both ends are controlled and governed by signals under
the control of the Dispatcher or Operator.
CONTROLLED SIGNAL: A fixed signal,
capable of displaying Stop indication, that is controlled by a
Dispatcher or Operator.
CROSSOVER: A combination of two switches
connecting two adjacent tracks. When lined, this switch combination
allows movements to cross from one track to the other.
CURRENT OF TRAFFIC: The assigned
direction of movement on a Rule 251 main track, as specified in the
DERAIL: A track safety device designed to
guide a car off the rails at a specific spot as a means of protection
against collisions or other accidents.
DISTANT SIGNAL: A fixed signal used to
govern the approach of a train to a home signal.
DIVISION: That portion of the railroad
system assigned to the supervision of a Superintendent.
DIVISION NOTICE (DN): A publication
issued periodically by the designated officer, which contains
instructions or information which do not affect the movement of
DUAL CONTROL SWITCH: A power-operated
switch also equipped for hand operation.
EFFECTIVE LOCKING DEVICE: A switch
padlock that is vandal and tamper resistant, and can be unlocked only
be the class, group or craft of employees that applied it.
EFFECTIVE SECURING DEVICE: A device
applied to secure a manually operated switch or derail for the
protection of Roadway Workers. The device must be vandal and tamper
resistant, and designed to be applied, secured, uniquely tagged and
removed only by the class, group or craft of employees for who the
protection is provided.
ELECTRICALLY LOCKED SWITCH: A
hand-operated switch equipped with an electrically controlled device
that restricts the movement of the switch.
ENGINE (Eng): A unit or combination of
units propelled by any form of energy and operated from a single
control, used in train or yard service. The word “engine” may also be
used to identify control cars.
ENGINE SERVICING TRACK AREA: One or more
tracks within an area in which the testing, servicing, repairing,
inspecting, or rebuilding of engines is under the exclusive control of
mechanical department personnel.
EXTRA TRAIN: A train not designated by a
FIXED SIGNAL: A signal at a fixed
location that affects the movement of a train.
FORM D CONTROL SYSTEM (DCS): A block
system, signaled or non-signaled, in which the movement of trains
outside of yard limits is authorized by Form D.
GENERAL ORDER (GO): A publication used to
summarize changes to the Timetable and other instruction manuals.
General Orders contain revision pages for the Timetable and are issued
periodically by the designated officer.
HOME SIGNAL: A fixed signal governing
entrance to an interlocking or controlled point.
INDUSTRIAL TRACK (Ind): A track other
than a main track, running track, siding or yard track, upon which
movements must be made at Restricted Speed.
INTERLOCKING (Int): An interconnection of
signals and signal appliances such that their movements must succeed
each other in a predetermined sequence, assuring that signals cannot
be displayed simultaneously on conflicting routes. Interlocking rules
are in effect in an interlocking.
INTERLOCKING APPLIANCES: The parts of an
interlocking that are capable of movement-switches, derails, locks,
movable point frogs, movable bridges, etc.
INTERLOCKING LIMITS: The tracks between
the opposing home signals of an interlocking.
INTERLOCKING SIGNALS: The fixed signals
of an interlocking.
INTERLOCKING STATION: A location from
which an interlocking is operated.
JUNCTION (Jct): A location designated by
the Timetable where two or more railroad lines converge.
MAIN TRACK: A track designated by
Timetable upon which train movements are authorized by ABS, DCS, or
MAINTENANCE OF WAY (MW)
MARKER: A reflector, flag, or highly
visible marking device, in the red-orange-amber color range, affixed
to the rear of a train to indicate that the train is complete.
MILE POST (MP)
MILES PER HOUR (MPH)
MOVABLE POINT FROG: A frog with a moving
alignment, allowing open flangeway for train movement.
MOVEMENT PERMIT FORM D: A form containing
written authorization(s), restriction(s), or instruction(s), issued by
the Dispatcher to specified individuals.
OCCUPIED CAMP CAR SIGNAL: A white
circular sign with black letters, which must be supplemented by a
white light at night. When displayed, it signifies that employees are
in, around, or in the vicinity of camp cars.
OVERHEAD BRIDGE (OH Br)
PANEL BLOCKING DEVICE APPLIED (PBDA)
PANEL BLOCKING DEVICE REMOVED (PBDR)
PILOT: An employee assigned to a train or
track car when the Engineer, Conductor or Track Car Driver is not
qualified on the physical characteristics or the operating rules of
the territory to be traversed.
PUSH-PULL TRAIN: A passenger train with a
Multiple Unit (MU) or control car on either end.
RETURN MOVEMENT: The movement of an
uncoupled engine (or engines) of leading portion of a train, directed
back toward the remaining stationary portion of the same train.
REVERSE MOVEMENT: A movement opposite the
direction previous authorized.
ROADWAY WORKER: Any employee of a
railroad, or of a contractor to a railroad, whose duties include and
who is engaged in the inspection, construction, maintenance or repair
of railroad track, bridges, roadway, signal and communications
systems, electric traction systems, roadway facilities or roadway
maintenance machinery on or near the track or with the potential of
fouling a track, and employees responsible for their protection.
RULES-IN-EFFECT: The specific operating
rule or group of operating rules that govern the use of tracks, as
designated by the Timetable.
RUNNING TRACK: A designated track on
which movements may be made by signal indication or at Restricted
Speed under the authority of an employee designated in the Timetable.
SCHEDULE: The part of the Timetable that
prescribes direction, number, frequency, and times for movement of
SCHEDULED TRAIN: A train designated by
SEMI-AUTOMATIC SWITCH: A hand-operated
switch that is designed to be trailed through in either position. The
switch points stay in the position last used.
SIDING: A track adjacent to a main track
and used for meeting or passing trains.
SIGNAL ASPECT: The signal appearance,
which conveys an indication as viewed either (1) from the direction
of an approaching train, or (2) on the cab signal display unit in the
engine control compartment.
SIGNAL INDICATION: The required action
conveyed by the aspect of a signal.
SPECIAL INSTRUCION (SI)
SPEED CONTROL: A device on an engine
which will cause a penalty application of the brakes if the engineer
fails to reduce the train’s speed to the speed required by the cab
NORMAL SPEED: The maximum
LIMITED SPEED: For passenger
trains, not exceeding 45 MPH: for freight trains, not exceeding 40
MEDIUM SPEED: Not exceeding
SLOW SPEED: Not exceeding 15
RESTRICTED SPEED: (Refer to
Rule 80, “Movement at Restricted Speed”)
SPRING SWITCH: A hand-operated switch
that is designated to be trailed through in either position. The
switch points automatically return to their original position after
being trailed through.
STATION: A place designated on the
station pages of the Timetable by name.
TEMPORARY BLOCK STATION (TBS): A manned
station that is established by Bulletin Order or Form D to control the
movement of trains.
TIMETABLE: A printed booklet that
contains schedules and/or special instructions affecting the movement
TRACK BARRICADE: A designated sign or
obstruction fastened to a track that prevents access to the track.
TRACK CAR (TC): Equipment, other than
trains, operated on a track for inspection or maintenance. Track cars
might not shunt track circuits.
TRAIN: An engine with or without cars.
UNDERGRADE BRIDGE (UG Br)
YARD: A system of tracks used for the
making up of trains and storing of cars. Movements in a yard must be
made at Restricted Speed.
YARD LIMITS: The main track area between
the Yard Limit signs as designated in the Timetable. Movements within
Yard Limits are governed by Rule 93.