Bahn

• pl.Bahnen

1. route, trail
2. rail transport
3. tram, train; especially a regional commuter train, otherwise more often Zug
4. Short for Autobahn.
5. Short for Fahrbahn (“lane [of a road]”).
6. A large, wide sheet of material used for waterproofing roofs and other structures; waterproofing membrane
7. orbit