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Jack:

Wee-Z bond is a registered trademark of the General Railway Signal. General Railway Signal is now part of Alstom. The patent application for the Wee-Z bond was made in 1976 so it has long sense expired. United States Switch and Signal also make a nearly identical device. They also make versions that are tuned to frequencies that WMATA does not use.

For all practical purposes a Wee-Z bond is an isolation transformer that prevents traction power return current form entering the train control room where the track circuit transmitters and receivers are located.

by Sand Box John on Mar 6, 2010 10:19 pm • link • report

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