GER Johnson

The GER Johnson Class refers to the series of 2-4-0 express passenger and mixed-traffic locomotives designed by Samuel Waite Johnson during his tenure as Locomotive Superintendent of the Great Eastern Railway from 1866 to 1873. Johnson, who would subsequently go on to even greater fame at the Midland Railway where he designed the celebrated Spinner single-driver class and the Compound rebuilds, made his professional reputation initially at Stratford, where he modernised the GER's motive power and introduced a series of capable express and mixed-traffic types that gave the railway sound foundations for its expansion in the 1870s and 1880s.

Johnson's GER 2-4-0 classes used the wheel arrangement that had become standard for British express and mixed-traffic working in the 1860s — a leading single axle, two coupled driving axles — with inside cylinders and saturated parallel boilers of generous proportions for the period. Johnson designed several 2-4-0 variants at Stratford, differing in coupled wheel diameter and cylinder dimensions to suit express or secondary passenger and goods work. The most significant of these was the class built in 1868, which formed the core of the GER's express passenger fleet in the early 1870s.

Johnson left the GER for the Midland Railway in 1873, where he went on to produce some of the most celebrated locomotives of the Victorian era including the single-driver express engines and the Midland Compound. His Stratford period is less celebrated but historically important as the context in which he developed the design abilities he would deploy to greater effect on the larger canvas of the Midland. None of his GER designs survives in preservation.