History
The last 5 Patriots of Henry Fowler's Patriot class on order, 5552 to 5557, were built with William Stanier’s taper boiler and so became the first of the Jubilee class. 113 locomotives were ordered straight from the drawing board. They were initially a disappointment; their moderate degree of superheating often left them short of steam. Changes to the blastpipe and chimney dimensions helped to transform them.
On 29 April 1935 no. 5552, the first of the class, permanently swapped identities with no. 5642 which had been named Silver Jubilee on 19 April 1935 in recognition of the Silver Jubilee of King George V on 6 May of that year. This change gave the name to the rest of the class, see LMS Jubilee Class 5552 Silver Jubilee. Earlier on (from summer 1934), they had been known as the "Red Staniers" (because of the crimson livery), to distinguish them from the "Black Staniers" (the LMS Stanier Black Five class).
They are often associated with the Midland Division, i.e. the lines inherited from the former Midland Railway. This is because until the late 1950s, it was rare for any 7P locomotives to work south of Leeds. Until then, Jubilees were the largest express engine normally found on the lines running out of St Pancras or radiating from Derby. They could nevertheless be found on main lines throughout the former LMS system.
The power classification was 5XP, in common with the earlier Patriot class. In January 1951, the classification was revised to 6P; this was revised again to 6P5F in November 1955, but the latter change was not applied to the locomotives' cabsides, which continued to show 6P. The two rebuilt locomotives (nos. 5735/6) were reclassified 6P in July 1943, being revised to 7P in 1951.
Read more about this topic: LMS Jubilee Class
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