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US 5,178,349 AGranted
Railroad signal system
AssigneeComstock Group, Inc.
InventorDominick Marengo
Life of this patent
Estimating the term…
Abstract
An improved railroad signal system is described in which a train is allowed to approach a block even if a red light is activated for the block. A white numbered light is activated indicating the maximum permissible speed of the train. The system includes a home clearing relay and a station timing relay which are activated by two separate circuits thereby eliminating a wire loop.
Claims1
A railroad signal system comprising:
- a first circuit for energizing a station timing relay, said station timing relay including a closed timing relay contact, and a timing relay coil, said first circuit including a train sensing contact connected in series with said timing relay coil and a first power feed line;
- a second circuit for energizing a home clearing relay having a home clearing relay coil and a home clearing relay contact, with said closed timing relay contact being in series with said home clearing relay coil, and a second power feed line separate from the first power feed line;
- and
- a light circuit comprising a green, a yellow, a red and a white numbered light, said light circuit being coupled to said home clearing relay contact for alternately activating said lights.
1 more element
Dependencies are inferred from the claim text.