Route 15, commonly known as the Girard Avenue Trolley, was restored in 2005 after having been operated with buses for 13 years. The 15 line runs along Girard Avenue through Greater Kensington, North Philadelphia, and West Philadelphia. The trolley utilizes restored PCC streetcars, a type of heritage trolley built in the 1930s. The trolleys were rebuilt with added air conditioning and regenerative braking. Route 15 is the only active trolley line in Philadelphia that is not part of the Subway-Surface Trolley Line system.