Callowhill Depot is a bus and trolley barn operated by the Southeastern Pennsylvania Transportation Authority (SEPTA), located in West Philadelphia, near the Delaware County border. It was built in 1913 by the Philadelphia Rapid Transit Company (PRT) and was later operated by the Philadelphia Transportation Company (PTC) before being taken over by SEPTA. The depot was constructed as part of the Thomas E. Mitten modernization program. Since its construction, the depot has suffered fire damage and reconstruction in 1949, 1950, and 1995.