Stumped by wiring issue: I've been using NCE Power cab with the NCE SB5 for years with no problems on my layout. Recently I installed nearly 30 Tortoise machines with separate DCC power. Six of the machines control three crossovers (2/crossover). All of a sudden when I activate one of the mainline crossovers to divert to the other route I get a momentary short - as one might get using a reversing loop. The locomotive(s) stop and then restart in second or two. It does not happen when "switching" back to the "through" route. It's diving me nuts! Help? Thoughts?
