The South Australian Railways 400 class comprised ten 4-8-2+2-8-4 articulated steam locomotives built in France in 1952 and 1953 under licence to Beyer, Peacock & Co. Ltd, Manchester, UK. The locomotives mainly hauled ore on the narrow-gauge line from the New South Wales/South Australia border to smelters at Port Pirie until 1963, when they were replaced by diesel locomotives. They also operated on the line to the break-of-gauge station at Terowie. Some locomotives were returned to service in 1969 while narrow gauge diesel locomotives were converted to . Subsequently some were stored at Peterborough before being scrapped.
Two have been preserved, in static condition: No. 402 at the Zig Zag Railway, Lithgow No. 409 at the National Railway Museum, Port Adelaide.