Thanks Bill,
I got it all reassembled (except for the headlight wires because I'm waiting for my soldering iron to come in) but everything is working perfectly and the train looks great! As it turns out, the shell fits right over the additional plug in the back so I did not need to cut a second hole for the additional plug. I tried to attach a picture of the locomotive with the new chassis but it kept on saying that the file was too large (even though it was only 67kb) Thanks for all of your help and advice!
I got it all reassembled (except for the headlight wires because I'm waiting for my soldering iron to come in) but everything is working perfectly and the train looks great! As it turns out, the shell fits right over the additional plug in the back so I did not need to cut a second hole for the additional plug. I tried to attach a picture of the locomotive with the new chassis but it kept on saying that the file was too large (even though it was only 67kb) Thanks for all of your help and advice!