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Just had a look through an old ABC, and the third rail units on Merseyside (Classes 502, 503 and 507) are all described as having air operated sliding doors.
Class 502 (Liverpool - Southport) and Class 503 (Wirral and Mersey) were introduced in 1939 and do have a bit of an American look about them. Would they be the ones that you remember John?
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