I need a little help....

That's unfortunate. I was really hoping I had a clue as to what might've happened to it. You said one of the other two engines worked, so how did you know if you didn't have any controllers? Unless you did have one and remember which engine responded. If you still had the chassis with all the equipment on it, it should've been (relatively) easy to mount a 3x AAA pack on a custom battery car (probably a spare Troublesome Truck chassis) and wire Thomas to the pack. Ucwepn modded his Flip Face Toby to replace the copper truck with Henrietta, so it might be possible to do with the RC engines. Thanks for the update, and better luck next time.