ok i just got done powering my little girls toy story train . that is the train she wanted under the tree this year. it was very easy. i just used the motor and power functions off the new cargo train . 1st i put the big red wheels right on the motor. dropped one plate off the bottom of the locomotive, and it sat level. 2nd i put the ir reciever in the passenger car. no mod here. just opened the doors so wires could run in and out. 3rd i put the battery box in the box car. this worked really nice. i added a few parts to the trap door to turn the battery on and off when you push on the door. the train runs just fine on the first three speeds after that it goes so fast that it will fly right off the track. we only use the first three speeds. overall i am very happy how simple this was to do. there is also still plenty of room for woody and all his pals to ride on the train.