King

The King was a 4-6-0 steam locomotive built by the Great Western Railway, entering service in 1927. Thirty locomotives were constructed over the next decade, and all were named after British monarchs, hence the class designation. These engines hauled express passenger trains on the GWR network, particularly the prestigious services between London and Bristol, Birmingham, and South Wales.

A King displaced 6,081 imperial gallons of water and burned up to 10 tons of coal per journey. The boiler pressure sat at 250 pounds per square inch, and the three cylinders generated a tractive effort of 40,300 pounds force. Driving wheels measured 6 feet 8 inches in diameter, enabling speeds approaching 90 miles per hour on suitable track. These dimensions made the King one of the largest and most powerful express classes in Britain during the 1920s and 1930s.

The class proved reliable in regular service, though the complexity of three-cylinder compounds created maintenance demands. Footplate crews valued the responsive handling and consistent steaming, though fuel consumption could stretch shed budgets on longer routes. Individual engines developed distinct characteristics over years of service, and some became known for better coal economy than others under skilled handling.

Variants and later life

The design remained largely unchanged throughout production, with minor modifications to smokebox details and superheater arrangements in later examples. After World War Two, the Kings continued on express work until diesel-electric traction displaced them in the late 1950s. Several were preserved; one example survives in working order and has occasionally operated railtours on heritage lines, demonstrating the class's durability and appeal to modern enthusiasts.

The King class name endures as a marker of Great Western Railway prestige engineering. Its contemporary rivals included the Stanier Pacifics of the London Midland and Scottish Railway, and debates over which class represented superior design continue among railway historians. The Kings remain significant for their demonstration that four-coupled express engines could compete effectively with Pacific wheel arrangements under skilled operation.