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

EXCEPTION HANDLING

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

AUTOMATIC CONTROL SYSTEM

A control system having one or more automatic controllers connected in closed loops with one or more processes. Also known as regulating system.

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.

CLASSIFICATION TRACK

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

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.

CONTACTOR CONTROL SYSTEM

A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.

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.

SUCTION SIDE

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

AUTOMATIC FROST CONTROL

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

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