The British Rail Class 315 was a fleet of alternating current (AC) electric multiple unit trains, built by British Rail Engineering Limited at Holgate Road Carriage Works in York between 1980 and 1981; they replaced the Class 306 units. It was the fifth and final variant of unit derived from British Rail's 1971 prototype suburban EMU design which, as the BREL 1972 family, eventually encompassed 755 vehicles across Classes 313, 314, 315, 507 and 508. Revenue services with Class 315 units commenced in 1980 and continued until December 2022.