Hmmm, interesting. I would have expected it to stay on as long as it was switched to the siding. We need someone to comment whom actually uses Kato Uni-track.this are new, thought I would try one on a dead end siding, using #4 turnout, and when switch is thrown bumper flashes but dose not stay on when switched to siding, the lighted bumper package says for non power routing only do I switch screws on bottom of turnout