Railway switches and signals – Block-signal systems – Automatic
Patent
1982-07-12
1985-11-05
Caldwell, Sr., John W.
Railway switches and signals
Block-signal systems
Automatic
246 3, 246 26, B61L 2100
Patent
active
045508895
ABSTRACT:
Reversal of the established traffic direction is initiated by a request for an entering train movement at the existing exit end of the single track stretch. This deenergizes the adjacent traffic line circuit section in the new direction. Line circuit deenergization cascades section by section through the stretch to the other end. At each location, the active traffic direction register relay is deenergized but the magnetic stick traffic relay holds in its established traffic position. At the new exit end, reception of the deenergization signal reverses positions of the traffic and direction register relays if the new approach track circuit is clear. This initiates the transmission of line circuit energy in the opposite direction. At each intermediate location, reception of this opposite direction line energy energizes the other direction register relay if the approach track circuit is clear. This positions the traffic relay for the reversed traffic direction to transmit line energy through the approach traffic line circuit. Application of line energy in the new direction cascades and, when received at the new entrance end, traffic end direction register relays position to establish the new traffic direction and authorize the train movement. Such action assures that all traffic relays are properly positioned and that the stretch is clear of trains.
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American Standard Inc.
Caldwell Sr. John W.
Heim Michael F.
Williamson, Jr. A. G.
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