Joseph E Webster

US Patent:

41335066, Jan 9, 1979

Filed:

Nov 1, 1977

Appl. No.:

5/847438

Inventors:

Joseph Webster - Conneaut OH

International Classification:

B61L 304

US Classification:

246172

Abstract:

A system for sensing derailment of a remotely controlled engine including a switch integrated with a dead man control circuit for the engine to automatically stop the engine upon activation of the switch. The switch further includes a deformable copper pipe having a brass rod within the pipe but electrically insulated therefrom. The copper pipe with the brass rod, each having a terminal electrically connected to the circuit, is placed between rails in a rail yard. When the engine derails the wheels of the engine or some other part of the train press the copper pipe in communication with the brass rod thereby activating the switch and shutting down the engine.