I have a Lionel SD70ACE that was operating perfect including the smoke unit 
. I had a car derail, when I reset the power the Diesel would not move correctly. It moves as if it the brake is on or too many cars to pull. I turned off track power, restarted no go. If I continue to turn speed knob on Cab 1 it does not go any faster. Diesel will roar more while adjusting to higher speed. I have it pulling four passenger cars. All other engine controls work fine using the Cab 1 except the brake lever. When I move the brake all the way to full brake the Diesel does not respond. When I press emergency stop on the Cab 1 diesel makes a louder noise, you hear the voice announcement that emergency stop is in progress the diesel does not stop. If I let it run it will eventually start running very fast, I cannot make it slow down. I tried engine reset, restarting, and shutting power to track. I checked the wheels, traction tires are present. I tried running it without cars, no difference in running.
