1
Richard H Noens: Electronic railroad track marker system. Vapor Corporation, Francis J Lidd, August 9, 1977: US04041448 (9 worldwide citation)

A locomotive is fitted with a transmit and a receive coil. Resonant circuits are packaged within a housing that is secured at a preselected point along a railroad track to serve as a position marker. When the locomotive passes the marker, a signal is coupled from the transmit coil in the locomotive ...


2
Electronic railroad track marker system. Vapor, March 3, 1978: FR2360453-A1

A locomotive is fitted with a transmit and a receive coil. Resonant circuits are packaged within a housing that is secured at a preselected point along a railroad track to serve as a position marker. When the locomotive passes the marker, a signal is coupled from the transmit coil in the locomotive ...


3
Noens Richard H: Systeme de reperage electronique pour voie ferroviaire, Electronic railroad track marker system. Vapor Canada, December 18, 1979: CA1068387

Title of the Invention: ELECTRONIC RAILROAD TRACK MARKER SYSTEM Inventor: Richard H. Noens ABSTRACT OF THE DISCLOSURE A locomotive is fitted with a transmit anda receive coil. Resonant circuits are packaged withina housing that is secured at a preselected point alonga railroad track to serve as a po ...


4
Electronic railroad track marker system. Vapor, July 1, 1981: GB1592183-A

A locomotive is fitted with a transmit and a receive coil. Resonant circuits are packaged within a housing that is secured at a preselected point along a railroad track to serve as a position marker. When the locomotive passes the marker, a signal is coupled from the transmit coil in the locomotive ...