Initially built as saturated, from 1910 to 1914 they were equipped with superheated boilers.

These locomotives were notable for their work north of Leeds, over the difficult Settle and Carlisle route.

They passed to the London, Midland and Scottish Railway (LMS) in 1923 and were withdrawn between 1925 and 1929.

In 1926, the eight surviving locomotives were renumbered 801 to 809 to free up their old numbers for more compounds.

This article relating to steam locomotives operated in the United Kingdom is a stub.