description SR Merchant Navy Class Overview
The SR Merchant Navy Class is a class of thirty 4-6-2 Pacific steam locomotives designed by Oliver Bulleid for the Southern Railway, entering service in 1941. Built for express passenger trains, they featured distinctive air-smoothed casing and an unconventional chain-driven valve gear enclosed in an oil bath. Between 1956 and 1960, British Railways rebuilt all thirty locomotives into a more conventional, un-streamlined design to reduce maintenance complexities.
help SR Merchant Navy Class FAQ
Why did the Merchant Navy Class originally have air-smoothed casing?
Oliver Bulleid enclosed the boiler and machinery in air-smoothed casing partly to simplify cleaning through carriage washers and create a modern appearance. Despite its streamlined look, it was not conventional aerodynamic streamlining in the manner of an LMS Coronation.
Why did British Railways rebuild the Merchant Navy locomotives?
The rebuilds replaced Bulleid's enclosed chain-driven valve gear with conventional Walschaerts valve gear and removed the air-smoothed casing. This made maintenance easier and addressed reliability and adhesion concerns.
How many SR Merchant Navy locomotives were built?
The Southern Railway built 30 members of the class between 1941 and 1949. All were later rebuilt by British Railways into the more conventional form.
Which Merchant Navy locomotives survive in preservation?
Eleven members of the class survive, including 35028 Clan Line, 35005 Canadian Pacific, and 35006 Peninsular & Oriental S. N. Co. Clan Line is particularly well known for mainline charter operation.
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