For those who don't know, Starlight Express is a musical about a train. Not what happens ON a train, but the train itself, as represented by a group of roller skaters. According to Wikipedia, the show started out as an adaption of Thomas the Tank Engine, but ALW couldn't get the rights so he made up his own story about trains coming to life. I remember trying to listening to the cast recording once and all I heard was loud noises. It's the kind of thing that could have only been made in the 80s.
I don't always get the really obscure Family Guy jokes, but they nailed it in this case: