Defintions

Front

BLOCK

Back

A length of track of defined limits, the use of which is governed by block signals, block-limit signals, automatic speed control or any combination thereof.

Front

ABSOLUTE BLOCK

Back

A block established between block stations, block limit stations, interlockings or any combination thereof which must not be occupied by more than one train except as provided by the rules.

Front

AUTOMATIC BLOCK SIGNAL SYSTEM

Back

A block signal system wherein the use of each block is governed by an automatic block signal, the cab signal indicator or both.

Front

BLOCK SIGNAL SYSTEM

Back

A series of consecutive blocks.

Front

MANUAL BLOCK SIGNAL SYSTEM

Back

A block signal system wherein the use of each block is governed by block signals controlled manually by block-limit signals or both, upon information received by telephone, radio or other means of communication.

Front

AUTOMATIC SPEED CONTROL SYSTEM (ASC)

Back

A system so arranged that its operation will automatically result in a full service application of the train brakes if, while operating under a speed restriction, the speed of the train exceeds the predetermined rate.

Front

SPEED CONTROLLED TRAIN

Back

A train equipped with speed control apparatus, a cab signal indicator, sealed application valve or switch, audible warning device and acknowledging switch, in operative condition for the direction in which it is to move.

Front

ENGINE (ENG)

Back

A unit propelled by any form of energy or a combination of units operated from a single control, used in road or yard service.

Front

MULTIPLE UNIT EQUIPMENT

Back

Equipment capable of being propelled by electrical energy through the use of third rail contact shoes.

Front

TRACK CAR

Back

A roadway maintenance machine, not classified as an engine, which is operated on track for inspection or maintenance. It may not shunt track circuits or operate signals and will be governed by rules and special instructions for trains other than passenger trains.