A railroad system for controlling train movements by using signals between block posts, that is, the structures that contain the instruments indicating the positions of trains, conditions within block sections, and control levers for signals and other functions.



Related Terms

PERMISSIVE BLOCK SYSTEM

A block system in which a railroad train is permitted to enter a block section already occupied by a train.

EXCEPTION HANDLING

The actions taken by a control system when unpredictable conditions or situations arise in which the controller must respond quickly.

AUTOMATIC FROST CONTROL

Control which automatically cycles refrigerating system to remove frost formation on evaporator.

SUCTION SIDE

Low-pressure side of the system extending from the refrigerant control through the evaporator to the inlet valve of the compressor.

FEEDBACK COMPENSATION

Improvement of the response of a feedback control system by placing a compensator in the feedback path, in contrast to cascade compensation. Also known as parallel compensation.

CLASSIFICATION TRACK

A railroad track used to separate cars from a train according to destination.

COMPENSATION

Introduction of additional equipment into a control system in order to reshape its root locus so as to improve system performance. Also known as stabilization.

LEAN MANUFACTURING

A production system consisting of manufacturing cells linked together with a functionally integrated system for inventory and production control that uses less of the key resources needed to make goods.

MANUAL FROST CONTROL

Manual control used to change operation of refrigerating system to produce defrosting conditions.

AREA TRIANGULATION

A system of triangulation designed to progress in every direction from a control point.

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