GCR 11B Class

The GCR Class 11B was a series of 4-4-2 Atlantic express passenger locomotives designed by John George Robinson and introduced in 1897 at Gorton Works for the Great Central Railway's principal London Marylebone services. The Atlantic — four leading wheels, four coupled driving wheels, two trailing wheels — was becoming established as the most powerful British express configuration of the late 1890s and early 1900s, offering greater steam capacity than the 4-4-0 through its longer boiler supported by the trailing axle, while retaining the large coupled driving wheels that gave express speed. Robinson adopted the Atlantic for the GCR's heaviest express working, and the 11B gave many years of capable service on the London–Manchester corridor.

The 11B Atlantics were built in several batches between 1897 and 1906 and were the Great Central's premier express type during that period. With 6 ft 9 in coupled driving wheels, the class was capable of sustained high-speed running on the GCR's main line south from Sheffield and Leicester to Marylebone. Robinson's locomotives were characterised throughout his career by handsome proportions and a neat, purposeful appearance, and the 11B Atlantics were among the most elegant British 4-4-2s of the period.

After the 1923 Grouping the GCR Atlantics passed to the LNER, which classified them as Class C4. Under the LNER they worked secondary express and fast secondary duties as newer and more powerful Gresley Pacifics and Santringham-type locomotives took over the principal workings. The C4s were withdrawn progressively through the 1940s, the last going in 1950. None was preserved, though Robinson's subsequent GCR Director 4-4-0 class is well represented in preservation through the LNER D11 examples.