GCR Class 9P was a design of four-cylinder steam locomotive of the 4-6-0 wheel arrangement built for hauling express passenger trains on the Great Central Railway in England.

[2] John G. Robinson served as Chief Mechanical Engineer of the Great Central Railway (GCR) from 1900 to 1922.

Towards the end of his period of office, he introduced two classes of 4-6-0 locomotive with four cylinders and large-diameter boilers.

These rocking shafts caused the two valves on each side to move forwards and backwards together, and since the inside and outside cylinders on each side were out of phase by 180°, the valves of the outside cylinders were arranged for outside admission, instead of the normal inside admission layout.

It was intended to convert the remaining two Class B3/1 locomotives, but the outbreak of war meant that they were never modified, and retained Stephenson valve gear until withdrawal.

6166 Earl Haig of Class B3/2 was found to have cracked cylinders, and was selected by Edward Thompson for rebuilding with two outside cylinders, ten-inch piston valves actuated by Walschaerts valve gear and a round-top boiler of the same design (known as Diagram 100A) as was used on his Class B1 4-6-0.

[15] The wheels, bogie and rear part of the main frames were retained, as was the tender, but all the other components were new.

[16] It was reclassified B3/3, and returned to service in October 1943, retaining its number but losing its name, since there was no suitable place to affix the nameplates.

[17] No further rebuilds followed; the reconstruction weakened the frames, and although this locomotive was the sole member of the class to be inherited by British Railways, it survived only until 1949.

429 giving up its name Sir Alexander Henderson at this time – he had been raised to the peerage the previous year), and no.

1164, 1166 and 1167 were named after significant British leaders of the First World War: Beatty was an Admiral in the Royal Navy; Haig was a Field-Marshal in the Army; and Lloyd George was Prime Minister.

employees who gave their lives for their country 1914–1918"; and on Armistice Day each year until the outbreak of the Second World War, it was decorated with poppies and hauled a train from Manchester London Road to Sheffield Victoria, carrying a party of railwaymen to a memorial service.