Route 10, also known as the Lancaster Avenue Line, is a trolley line operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) 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. It is one out of five lines that is part of the SEPTA's subway–surface trolley system and is 11.6 mi (18.7 km) long. It is the least used subway-surface trolley line, but unlike Route 11, the most used subway-surface trolley line, it has overnight service.