Route 10,[a] currently in the rebranding stage to become T1, it is one of the five routes that is part of the SEPTA subway–surface trolley lines that connects the 13th Street station in Center City Philadelphia, Pennsylvania, to the 63rd Street–Malvern Avenue station in the Overbrook section of West Philadelphia.

Service is operated by the City Transit Division of the Southeastern Pennsylvania Transportation Authority.

Continuing northwest on Lancaster Avenue, the Route 10 line crosses over 40th Street, where there is a southbound track which diverts Route 10 to 40th & Market Streets MFL station when the trolley subway tunnel is closed.

At 52nd Street the line reaches Lansdowne Avenue, where another cutback loop exists, installed in 1996 for emergency or schedule adjustments only.

Route 10 turns west on Lansdowne Avenue and at 60th Street, where now-abandoned tracks end just short of the line.

On December 15, 1906, the line was integrated into the subway–surface trolley system by the Philadelphia Rapid Transit Company and was extended to 63rd & Malvern Streets.