I have three BLI steam locomotives with the same problem...The sound works but the motor is unresponsive to commands from my NCE DCC system. In all three cases, the problem occurred after the loco shorted out when hitting a switch thrown against the direction of travel. The power section is protected by a DCC Specialties psx-1 circuit breaker. I have done a factory reset on each loco and ensured the pin connector is properly seated. Other suggestions?