05507457 is referenced by 31 patents and cites 11 patents.

An improvement in an End-of-Train (EOT) monitor system allows the continuity of the brake pipe of a train to be verified. Obstructions in the brake-pipe, such as, for example, closed angle cocks, kinks, blockages, or breaks, adversely affect brake safety. A pressure sensor is installed in the Locomotive Cab Unit (LCU) to sense brake application. If the brake pipe is intact, a brake application initiated from the locomotive should correspondingly result in a drop in pressure at the EOT unit. The time require for the drop to propagate through the train is a function of train length. If a pressure drop is not sensed at the EOT unit within a predetermined period of time, it is assumed to be due to either a corrupted brake pipe or a communications failure between the LCU and EOT unit. A Microprocessor in the LCU initiates a communications check by interrogating the EOT unit from the LCU. If no reply is received, an alarm sounds warning the engineer of a communications failure. If, on the other hand, the LCU receives a reply from the EOT to the interrogation, a brake pipe continuity alarm is sounded warning the engineer of a brake fault condition.

Title
Train integrity detection system
Application Number
8/387072
Publication Number
5507457
Application Date
February 13, 1995
Publication Date
April 16, 1996
Inventor
Robert C Kull
Montgomery County
MD, US
Agent
Whitham Curtis Whitham & McGinn
Assignee
Pulse Electronics
MD, US
IPC
B61L 23/00
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