A challenging prototype

[TommyDodd]

First question: Where would you hide the batteries?

http://www.youtube.com/watch?v=5r9gzVWA ... re=related

[JMORG]

Are you planning it to pull a load (hide it in a wagon)?

[MDLR]

Here's a thought - build a pair of TINY rechargeables into it for shunting & light engine moves (so it can) and couple it to a battery van with a changeover switch for use on a train. Don't forget to build the sound unit in as well................