Sequential checking of railway control signals
AssigneeWestinghouse Brake & Signal Co. Ltd.
InventorDavid J. Norton
Life of this patent
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Abstract
An electronic or computer-based railway control system including further safety checks in addition to normal safety interlocking. The present system carries out checks to see that operations, such as print switching and signal setting, are carried out in the correct sequence for a given route having regard to the position and movement of a train as indicated by track circuits. In a computer-based system appropriate checking routines may be written into the computer soft-ware.
Claims10
Railway control apparatus for generating control signals for controlling a plurality of signalling lamps and change points in a railway system, said apparatus including input means for receiving status signals from a plurality of devices which monitor the railway system, said status signals indicating the operative conditions of the devices, a control set responsive to the indicating signals for generating control commands for governing the movement of a train in the railway system, and control command sequence checking means for checking that control commands are generated in a correct sequence with regard to the indicated movement of the train.
Dependencies are inferred from the claim text.