B is a service on the S-train network in Copenhagen. It runs between Farum and Høje Taastrup and provides stopping services on the S-train system's Farum radia and Tåstrup radial.

Østerport station is a metro, S-train and main line railway station in Copenhagen, Denmark. It is located between the districts of Indre By and Østerbro, and is named for the historic Østerport city gate, near the original location of which it is located.