The British Rail Class 507 is a type of electric multiple unit (EMU) passenger train built by British Rail Engineering Limited at Holgate Road carriage works in two batches from 1978 to 1980. They were the second variety of British Rail's standard 1972 design for suburban EMUs derived from PEP stock, which eventually encompassed 755 vehicles over five classes (313, 314, 315, 507 and 508). They have worked on the Merseyrail network from new and continue to do so, having been refurbished by Alstom's Eastleigh Works. The Class 507 units are all now 42 or more years old.