but witch is witch? i have a bunch of the cheap 4 dollar each cars from bachman, with the square looking couplers on them , these was just to use to test my track work, and in till i can get better ones. i know alot of people change out the couplers, but what is the best ones to change them to? what kind to the better cars have? and i have 2 lifelike E-8 engines, on the back they have the square couplers and in the front they have a tiny coupler, a nuckle coupler i think, so i cant hook any cars to the front, can i fix that?