Hi I need help this my secound time having trouble with bachmann locomotives. first one was an ho i ran it and it stop working i returned it. this time i bought and n scale set it worked for a few hours the n it hesitated and stop its an EMD F9 diesel locomotive all wheel drive. i wiped the tracks and wheels of the locomotive it runs then it stops and doesnt want 2 run. i try it again it starts and stops.  its ez track .so i dont know what to do. buy another locomotive. this is frustrating. i have a lionel o g train and never had a problem with it. its been 5 years and it runs great. So someone please help ?