GCR Class 11E [LNER D6]

The GCR Class 11E, classified LNER D6 after the 1923 Grouping, was a series of superheated inside-cylinder 4-4-0 express passenger locomotives designed by John George Robinson and built at Gorton Works in 1910–12. The class was a contemporaneous development running alongside the D7 series, with detail differences in boiler specifications and construction that the LNER's classification system distinguished as a separate class. Both the D6 and D7 represented the penultimate stage of Robinson's GCR 4-4-0 express design evolution before the celebrated Director Class of 1913.

The D6's 6 ft 9 in coupled wheels and superheated inside-cylinder layout were consistent with Robinson's established GCR express 4-4-0 practice, and the class worked the London Extension's express and semi-fast services with the reliability and neat appearance that characterised Robinson's output throughout his career at Gorton. The difference between the D6 and D7 was in boiler detail — steam pressure, heating surface area, and related specifications — rather than any fundamental design philosophy, and the two classes worked interchangeably on similar duties.

Under the LNER the D6s worked secondary express duties on the former GCR main line before displacement by Gresley's more modern designs and eventual withdrawal. None was preserved.