Bill and Ben are 2 mischievous tank engine twins who work for the Sodor China Clay Company. They're always playing games, but in the end they will work the problems out. On the model, they have 2 different faces, to make them unique. These models have very nice detail on the sides, but miss out the special buffer shape. This has been improved on the Take-n-Play version by Fisher Price in 2010. Every detail and most importantly the buffers have been corrected.