04794548 is referenced by 58 patents and cites 12 patents.

An apparatus for monitoring the operation of a railroad train includes two on-board units which collect and utilize data for ultimate transfer to a portable unit which can be carried onto and off of the railroad train. One of these on-board units operates under microcomputer control to compute speed, acceleration/deceleration, and distance traveled data and to store such computred data for subsequent transfer to the portable unit. The other on-board unit acquires additional data under separate microcomputer control. This data acquisition retrieves either binary or analog data, or both, and stores it in the acquiring on-board unit for later transfer to a separate memory in the other on-board unit for subsequent transfer to the portable unit. Power failure detection circuits are also implemented to insure the microcomputers are initiated in respective determinate states.

Title
Data collection apparatus and train monitoring system
Application Number
6/901212
Publication Number
4794548
Application Date
August 28, 1986
Publication Date
December 27, 1988
Inventor
Gilbert H Forehand
Duncan
OK, US
C Lynden Lee
Duncan
OK, US
John E Haley
Duncan
OK, US
Michael J Lynch
Duncan
OK, US
Agent
E Harrison Gilbert III
James R Duzan
Assignee
Halliburton Company
OK, US
IPC
G11B 23/02
G11B 20/10
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