After testing, it appears the cause of the signal loss is the lighted cars. I parked the loco (PS3 Blue Comet) in the bridge approach block, set the track signal test, and started to add cars. With each car added, the signal dropped significantly. After adding 3 cars, the track signal was down to 1, sometimes 2. As soon as I removed the cars, back to a solid 10. What seemed to cure the problem is running another feed from the buss to the bridge approach block. Even with the cars on the track, the signal went to 10 when I did this. So, I'm thinking if I put in 2 limit switches (1 on each side of the bridge) and have each switch control the block on its side of the bridge, instead of 1 switch controlling both blocks, it looks like the problem may be fixed. Even with the lighted cars, the signal is a perfect 10 everywhere else, except for when the engine is in the block approaching the hinged side of the bridge, which is the longest feeder run on the layout. Thanks for the help.
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