LNWR Problem Class

Ramsbottom's 1859 design was a 2-2-2 with 7 ft 6 in driving wheels, outside cylinders (unusual for British practice of the period), parallel boiler, and Ramsbottom's own design of duplex safety valve. The class was built at Crewe in batches between 1859 and 1865, totalling 60 engines.

The Problem class worked LNWR expresses on the Euston–Crewe–Carlisle main line and on the West Coast Joint Stock services to Glasgow and Edinburgh through the 1860s and 1870s. They were progressively superseded by Webb's 2-4-0s and then by his compounds from the 1880s. Most were withdrawn in the 1890s, the last surviving until 1907. None were preserved.

2-2-2 with 7 ft 6 in driving wheels, outside cylinders mounted between the leading carrying wheels and driving wheels, parallel boiler with Ramsbottom safety valves on the firebox, brass dome.

• Problem, Lady of the Lake, Watt, Newton (1859–65, not preserved)