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 FROST CONTROL

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

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.

CASCADE CONTROL

An automatic control system in which various control units are linked in sequence, each control unit regulating the operation of the next control unit in line.

BANG-BANG CONTROL

A type of automatic control system in which the applied control signals assume either their maximum or minimum values.

CERTAINTY EQUIVALENCE CONTROL

An optimal control law for a stochastic adaptive control system which is obtained by solving the control problem in the case of known parameters and substituting the known parameters with their estimates.

TRAIN

To control motion in bearing.

AREA TRIANGULATION

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

AUTOMATIC-CONTROL BLOCK DIAGRAM

A diagrammatic representation of the mathematical relationships defining the flow of information and energy through the automatic control system, in which the components of the control system are represented as functional blocks in series and parallel arrangements according to their position in the actual control system.

ARTICULATED TRAIN

A railroad train whose cars are permanently or semi-permanently connected.

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