So one of the kids got the Harry Potter Hogwarts Express for Christmas and I thought I'd take the power functions out of the Holiday Train and add it easily to the HP train. No such luck. After reading up on some peoples mods with the tender and engine, I thought it would be much easier to add another carriage! Red and black to keep with the colour scheme, I added some lights, made sure the IR was showing and added a little button to turn the battery box on and off. Kids are happy anyway :-)