DEFINITIONS in GRS Railway - General Rules for Signallling

 DEFINITIONS in GRS Railway - General Rules for Signaling

ADEQUATE DISTANCE means the distance sufficient to ensure safety.

APPROVED SPECIAL INSTRUCTIONS means special instructions approved of or prescribed by the Commissioner of Railway Safety.

AUTHORIZED OFFICER means the person who is duly empowered by general or special order of the Railway Administration, either by name or by virtue of his office, to issue instructions or to do any other thing.

AUTHORITY TO PROCEED means the authority given to the Loco Pilot of a train, under the system of working, to enter the block section with his train.

AXLE COUNTER means an electrical device which, when provided at two given points on the track, proves by counting axles in and counting axles out, whether the section of the track between the said two points is clear or occupied.

BLOCK SECTION means that portion of the running line between two block stations on to which no running train may enter until Line clear has been received from the block station at the other end of the block section.

COMMISSIONER OF RAILWAY SAFETY means a “Commissioner of Railway Safety” appointed to exercise any functions under the Act and includes the “Chief Commissioner of Railway Safety.

COMPETENT RAILWAY SERVANT means a railway servant duly qualified to undertake and perform the duties entrusted to him.

CONNECTIONS when used with reference to a running line, means the points and crossings or other appliances used to connect such line with other lines or to cross it.


a) On a double line, the direction for which the line is signaled;

b) On a single line, the direction for the time being established, under the system of working, to allow trains to move in that direction.

LOCO PILOT means the engine Loco Pilot or any other competent railway servant for the time being in charge of driving a train.

ELECTRICAL COMMUNICATION INSTRUMENT means either a telephone or a Morse telegraph instrument.

FACING AND TRAILING POINTS Points are facing or trailing in accordance with the direction a train or vehicle moves over them. Points are said to be facing points when by their operation a train approaching them can be directly diverted from the line upon which it is running.

FIXED SIGNAL means a signal of fixed location indicating a condition affecting the movement of a train and includes a semaphore arm or disc or fixed light for use by day and fixed light for use by night.


FOULING MARK means the mark at which the infringement of fixed Standard Dimensions occurs, where two lines cross or join one another.

INTERLOCKING means an arrangement of signals, points and other appliances, operated from a panel or lever frame, so interconnected by mechanical locking or electrical locking or both that their operation must take place in proper sequence to ensure safety.

INTERMEDIATE BLOCK SIGNALLING means an arrangement of signaling on double line in which a long block section is split into two portions each constituting a separate block section by providing an Intermediate Block Post.

ISOLATION means an arrangement, secured by the setting of points or other approved means, to protect the line so isolated from the danger of obstruction from other connected line or lines.

LAST STOP SIGNAL means the fixed stop signal of a station controlling the entry of trains into the next block section.

LEVEL CROSSING means the intersection of road with railway track at the same level.

MULTIPLE ASPECT SIGNALING means a signaling arrangement in which signals display at any one time any one of the three or more aspects and in which the aspect of every signal is pre-warned by the aspect of the previous signal or signals.

OBSTRUCTION and its cognate expressions includes a train, vehicle or obstacle on or fouling a line, or any condition which is dangerous to trains.

RUNNING LINE means the line governed by one or more signals and includes connections, if any, used by a train when entering or leaving a station or when passing through a station or between stations.

STATION means any place on a line of railway at which traffic is dealt with, or at which an authority to proceed is given under the system of working.

SYSTEM OF WORKING means the system adopted for the time being for the working of trains on any portion of a railway.

TRACK CIRCUIT means an electrical circuit provided to detect the presence of a vehicle on a portion of track, the rails of the track forming part of the circuit.

TRAIN means an engine with or without vehicles attached, or any self propelled vehicle with or without a trailer, which cannot be readily lifted off the track.

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