TrackMaster Flip-Face Toby Experiment

Hey all!

So, I have a question for anyone who might be able to help me with this. I am doing an experiment with my TrackMaster Flip Face Toby:





Basically I’m trying to get it to run on its own without the battery car. But I’m confused as to how to wire the motor up with a battery, as I know the AAA and AA batteries won’t fit, because of the way the chassis is designed.

Does anyone have any suggestions as to what I could do for the wiring? Because I'm stumped at this point, hahaha