Block—A length of track of defined limits,
the use of which by trains and engines is governed by block signals.
Absolute Block—A block in which a train of engine
is not permitted to enter while it is occupied by another train
or engine except as prescribed by the rules.
BLOCK SIGNAL SYSTEMS
Automatic Block Signal System (ABS)—A block
signal system wherein the use of each block is governed by an automatic
Manual Block Signal System (MBS)—A block
signal system wherein the use of each block is governed by block
signals controlled manually upon information by telephone or other
means of communication.
Traffic Control System (TCS)—A block signal
system under which train movements are authorized by block signals
whose indications supersede the superiority of trains for both opposing
and following movements on the same track.
Division—That portion of the railroad assigned to the supervision of the Superintendent.
Branch—That portion of a division designated by timetable.
Interlocking—An arrangement of signals and
signal appliances so interconnected that their movements must succeed
each other in proper sequence and for which interlocking rules are
in effect. It may be operated manually or automatically.
Interlocking Limits—The tracks between the
extreme opposing home signals of an interlocking.
Route—The course or way which is, or is to be, traveled.
Conflicting Route—Two or more routes, opposing,
converging or intersecting, over which movements cannot be made
simultaneously without possibility of collision.
Fixed Signal—A signal of fixed location indicating a condition affecting the movement of a train or engine.
NOTE—The definition of a "Fixed Signal" covers
such signals as switch target, train order, block, interlocking,
speed signs, stop signs, yard limit signs, or other means for indicating
a condition affecting the movement of a train or engine.
Indication—The information conveyed by a
signal as viewed from the direction of an approaching train.
Block Signal—A fixed signal, or hand signal
in the absence of a fixed signal, at the entrance of a block to
govern trains and engines in entering and using that block.
Approach Signal—A fixed signal used to govern
the approach to another signal.
Home Signal—A fixed signal at the entrance
to a route or block to govern trains or engines entering and using
that route or block.
Interlocking Signal—The fixed signals of
Dwarf Signal—A low home signal.
Signal Mast—The upright to which a signal is directly attached.
Dummy Mast—A short upright, displaying a
blue light or reflector, placed on top of a bracket post, or bracketed
to the side of a signal mast, to show there is a track between the
bracket post or signal mast, and the track for which signals are
Bracket Post—An upright with a crosspiece on top of which is placed one or more masts.
Rear of a Signal—The side of the signal
from which the indication is received.
Advance of a Signal—The side of the signal
opposite to that from which the indication is received.
Normal Speed—The maximum authorized speed.
Limited Speed—Not exceeding 45 miles per hour.
Medium Speed—Not exceeding 30 miles per hour.
Reduced Speed—Prepared to stop short of train
Slow Speed—Not exceeding 15 miles per hour.
Restricted Speed—proceed prepared to stop short
of train, obstruction or switch not properly lined; looking out
for broken rail and not exceeding 15 miles per hour.
Station—A place designated in the timetable
Block Station—A place provided for the blocking
of trains by block signals or other means.
Interlocking Station—A place from which an interlocking
Control Station—A place from which remote control
signal appliances or switches are operated.
Control Point (CP)—A location where signals
and/or other functions of a traffic-control system are controlled
from the control machine.
Electrically Locked Switch—A hand-operated
switch equipped with an electrically controlled device which restricts
the movement of the switch.
Spring Switch—A switch equipped with a spring
mechanism arranged to restore the switch points to normal position
after having been trailed through.
Timetable—The authority for the movement
of regular trains subject to the rules. It contains classified schedules
with special instructions relating to the movement of trains and
Schedule—That part of a timetable which
prescribes class, direction, number, and movement for a regular
Main Track—A designated track upon which
trains are operated by timetable, train order, or both, or the use
of which is governed by block signals.
Single Track—A main track upon which trains
are operated in both directions.
Two or More Tracks—Two or more main tracks
upon any of which the current of traffic may be in either specified
Current of Traffic—The movement of trains
on a main track in one direction, specified in the timetable.
Secondary Track—A designated track upon
which trains or engines may be operated without timetable authority,
train orders or block signals.
Running Track—A track designated in the
timetable upon which movements may be made subject to prescribed
signals and rules, or special instructions.
Siding—A track auxiliary to a min or a secondary
track for meeting or passing trains.
Controlled Siding—A siding the use of which
is governed by signals under the control of a train dispatcher or
Yard—A system of tracks within defined limits
provided for making up of trains, storing of cars and other purposes,
over which movements not authorized by timetable, or by train order,
may be made, subject to prescribed signals and rules, or special
Track Car—A self propelled car with or without
trailers which may be manually moved to or from the track. The term
"Track Car" shall include other self propelled units,
such as: Burro Cranes, Highway Rail Cars, Detector Cars, Weed Burners,
Tie Tampers, and other similar equipment. This type equipment may
not operate signals or shunt track circuits.
Train—An engine or more than one engine
coupled, with or without cars, displaying a marker.
Regular Train—A train authorized by a timetable
Passenger Train—A train scheduled to carry
Extra Train—A train not authorized by a
timetable schedule. It may be designated as:
Extra—for any extra train except passenger
extra or work extra;
Passenger Extra—for passenger train extra;
Work Extra—for work train extra.
Superior Trains—A train having precedence
over another train.
Train of Superior Right—A train given precedence
by train order.
Train of Superior Class—A train given precedence
Train of Superior Direction—A train given
precedence in the direction specified by timetable as between opposing
trains of the same class.
Train Register—A book or form at designated
stations for registering trains, the time of arrival and departure
of trains and such other information as may be prescribed.