The original plan called for ten "future extensions" on top of the core system. The Red Line would have been extended from the Rockville station northwest to Germantown, Maryland. The Green Line would have been lengthened northward from the to Laurel, Maryland, and southward from the to Brandywine, Maryland. The Blue Line initially consisted of a southwestern branch to Backlick Road and Burke, Virginia, which was never built. The Orange Line would have extended westward through Northern Virginia past the Vienna station, and northeastward past to Bowie, Maryland. Alternatively, the Blue Line would have been extended east past Largo Town Center to Bowie. The future Silver Line was also included in this proposal.