WAGR RA class (diesel)

The WAGR RA class was a class of diesel locomotives operated by the Western Australian Government Railways (WAGR). Introduced in 1951, they were the first diesel-electric locomotives to enter service on the WAGR.

Built by the Metropolitan-Vickers-Beyer, Peacock partnership, the RA class locomotives were initially intended for mainline passenger and freight service. Their introduction marked a significant step in the modernization of the WAGR's motive power fleet, which had previously relied heavily on steam locomotives.

The RA class locomotives were characterized by their Co-Co wheel arrangement, meaning they had two three-axle bogies. This configuration allowed for good adhesion and weight distribution, making them suitable for hauling heavy loads over varying track conditions.

Over their service life, the RA class locomotives saw use on a variety of routes throughout Western Australia. They were eventually superseded by more modern locomotive designs and were withdrawn from service in the 1980s. A small number have been preserved.

Key features of the RA class included:

• Diesel-electric transmission: Power was generated by a diesel engine and transmitted to the wheels by electric traction motors.
• Co-Co wheel arrangement: Enhanced adhesion and weight distribution.
• Modernization effort: Played a key role in the WAGR's transition from steam to diesel power.