[1] These were developed from a series of five locomotives (2631–2635) introduced in 1902 by Samuel Waite Johnson, which had a 3-cylinder compound arrangement on the Smith system, with one high-pressure cylinder inside the frames and two low-pressure cylinders outside, and used Smith's starting arrangement.

From 1905 onwards, Johnson's successor Richard Deeley built an enlarged and simplified version, eliminating all the Smith refinements and fitting his own starting arrangement, making the engines simpler to drive.

The original Johnson locomotives were all subsequently renewed as Deeley compounds, including the now-preserved 1000 which was rebuilt and outshopped with a superheater in 1914.

1000 was set aside for preservation after withdrawal in 1951 and restored in 1959 close to its 1914 condition, painted in Midland maroon livery, running enthusiasts' specials until placed in the temporary Clapham Transport museum.

Though steamed since preservation, it is currently a static exhibit at the Barrow Hill Engine Shed at Derbyshire, having been lent by the National Railway Museum in York.