I run mine quite a bit, too. With 8 batteries, it will run forever! With the 4 batteries, it looks cool turning slower. I also reworked the 5th roadwheel back. On mine, both seemed out of line and lower than the others. It helped keep it from throwing track all the time, and released some of the track tension, too.

Tote, is yours like that (the 5th roadwheel)?