Speaking of Thomas the tank, we found this little battery operated jobber at Wal-Mart today and we decided this might be easier for our 3 year old to handle than the HO scale electric model. It's actually turned out to be a lot of fun. If I could figure out a way to make the switches remote operated, I'd almost start modeling a battery operated Sodor exclusively. 
Here's a short vid I put up on YouTube: http://www.youtube.com/watch?v=e8AJkeVris4
Cover your ears if you don't like Ozzy Osbourne.
Pics:

Here's a short vid I put up on YouTube: http://www.youtube.com/watch?v=e8AJkeVris4
Cover your ears if you don't like Ozzy Osbourne.

Pics: