I just got a new 4 car mth subway set and the 2extra cars
the 4 car set runs fine but when I add the extra 2 cars the engine
can not pull it . any help would be great pete
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Some models wont pull 6 cars due to the motor windings and curves , have no clue as to what you have? 
I have a mth lo v with 6 cars ,using a mth 1000 transformer,no problem have power to spare ,if its used check the rubber wheel inserts ,might be worn or non existing.
rich b
Wheel spin or motor stall? What radius curves are you using?
Which set is it?
I have the Rail King LoVs and the same problem. The grades on my El are significant (5 to 6%), and the LoV train had to be shortened to 4 cars, that is until I found a simple solution.
The track on my El is MTH Real Trax with solid rails. Using a flat stone at 90 degrees to the rails, I made score marks in the rails. Now the LoVs run up the grades without slipping and stalling.
Also be sure that the traction tires are not spinning on the wheels.
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