I have an A-B-A K-Line set of F-3s that have Rail Sound and TMCC. I may be getting an MTH dummy B unit unpowered. Will the Rail Sound and TMCC work if the teather is not connected through the MTH B unit or do I need to put A K-Line teather through the MTH B unit? Thank you for any help and take care. Choo Choo Kenny
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