Its east end is at the Washington District, and it crosses the Hagerstown District at Front Royal. Since the 1999 breakup of Conrail, when Norfolk Southern acquired the Lurgan Branch from the north end of the Hagerstown District into Pennsylvania, the B-Line east of Front Royal has been a major connection, allowing traffic on the Washington District to bypass Washington, D.C. The B-Line supports mainly intermodal and manifest trains, although beginning in late 2018, Norfolk Southern began running rerouted coal unit trains on it more frequently than before.
The eastern section is in the Washington District, crossing into the Hagerstown District at Front Royal. Since Conrail's dissolution in 1999, when Norfolk Southern acquired the Lurgan Branch from the northern end of the Hagerstown District and extended it to Pennsylvania, the B-Line east of Front Royal has been a vital link, allowing traffic on the Washington District to avoid Washington, D.C. The B-Line primarily transports intermodal and manifest trains, although since late 2018, Norfolk Southern has run more frequent rerouted coal unit trains.