The TIU Signal Tester used to identify the "trouble" cars was built from a kit designed by gunrunnerjohn and rtr12. The tester is designed for use on the TIU output, not at the track. It does give me a clue to the "trouble" passenger cars by removing all lighted cars from the consist (signal returned) and checking on track with consist one at a time and checking signal each time. Three of the seven cars had no effect on the signal. Four of the cars killed the signal.
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