I have a strange troubleshooting question. My HO loco will not start from a standing start. I have a Bachmann set with EZ track. My transformer has a red led that is variable with power. Higher the dial, brighter the light. Anyhow, my loco will not start from sitting still. LED goes out. When I still so that only one side of the loc is contacting the track it lights up again. If I quickly drop the loco on to the other side of the track it will begin to work however eventually it will stop. I have cleaned the track and this issue happens on all loco's not just that one. Do I have a transformer issue or a track issue?