Re: Short on the reverse loop
A loop needs both rails gapped at both ends, and the gapped section has to be longer than your longest train with metal wheels or lit coaches. If only one end is gapped the controller sees a dead short the moment the points are set for the return.
Measure the section before you cut anything else. On a 6 metre bus I would also check the feed to the loop comes from the reversing module and not from the main bus.