My 2 yo DS is obsessed with two things, Elmo and trains. Does anyone know if there is by some chance an episode of Elmo's World, Sesame Street or similar that shows Elmo on a train? I would buy the DVD if so but having looked on Amazon and elsewhere I can't find a DVD with a product description specifying something as niche as this. So perhaps some Mumsnetter will happen to know offhand if such an episode exists.