Densha de D (電車でD, lit. "D on trains") is a parody of Initial D, right down to the characters. The main difference is that instead of cars, Densha uses trains.
It is perhaps best-known for a scene in which Fujiwara Takumi, near the end of a a race, forces one of his train's axles onto the opposing track, in a technique described by Takahashi Keisuke as Multi-Track Drifting.