To be honest when you fit the DCC decoder try the loco straight away and see if the perfromance is as desired (Leaving the caps in). If it is then put the body on and move onto the next loco.
If it moves of suddenly at 100mph then the caps will probably need removing (As is the case with the Bachmann 37 as far as i know) and then that should cure that problem and bring it back to normal DC operation speed.
If it moves of suddenly at 100mph then the caps will probably need removing (As is the case with the Bachmann 37 as far as i know) and then that should cure that problem and bring it back to normal DC operation speed.
