The Deeprun Tram is a long, fully enclosed, underground (and partially underwater) set of double tracks upon which rolls two sets of three wagons, all credited to the gnomes' technical engineering. The service is fast and smooth, and is provided free of charge to travelers between the Alliance-aligned cities of Ironforge and Stormwind City. There is also a quest here that starts on the Ironforge side and ends on the Stormwind side that involves catching rats.