Design
A very modern design for the time, they were equipped with air-operated sliding doors. They were similar to (but somewhat larger than) the Class 503s operating on the Wirral, being both longer and wider, the latter allowing 3+2 seating on the Southport 502s compared to 2+2 seating on the Wirral 503s. In addition the 502s had distinctive large resistance cooling grids mounted on top of the cab roof of the motor units. Virtually all electric suburban passenger trains in Great Britain now follow the basic layout pioneered by the Class 502s and 503s, with two sets of double-leaf air operated sliding doors on each side of each carriage.
Read more about this topic: British Rail Class 502
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