I'm fixing up an old train set for my 5 year-old grandson for Christmas and need some help in finding a power controller.  The set is a Tri-Ang TT gauge train --late 1950s, early 1960s.  http://www.tri-angtt.org.uk/setTBX.htm - mine is the T.B. set.

The original came with a plastic battery box with 2 - 6-volt lantern batteries; the ones with the 2 gold springs on the top.  The original is broken and I'd like to stay away from batteries anyway.

I'd like a simple 12 volt electric power controller with forward and backward.  The original battery wires had small pins that connected to the track and show fairly well in the second photo on the webpage referenced above.  The track is a 3' by 2' oval. 

I'd appreciate any suggestions you might have  --thanks for your help!!