Thoroughbred set issues

[VirginiaRailFan08]

I have had the Thoroughbred set for about 6 months and now the locomotive seems to be having trouble picking up power from the tracks. When it stops, I have to push it a little bit before it will move again. I have already cleaned both the wheels and the tracks. Any ideas?

[Trainman203]

The question might be, how long was that set in storage at the warehouse before purchase  ?  Wheels and track aren't the only electrical contact points.