The locomotives in 4-6-2 wheel configurations meet this request. Introduced in 1933 with LMS serial numbers 62** later renumbered 462** by the British Railways, these machines were replaced in 1964 by electric locomotives.
The first series form the Princess Royal Class. From 1937 they are joined by the Coronation Class offering some performance and productivity improvements. The third batch of the Coronation Class is composed of numbers 6230 to 6234. In 1939 the Duchess of Abercorn, number 6234, sets the definitive power record for British rail steam while hauling a train of 20 coaches. The Duchess of Sutherland, number 6233, is one of three preserved Coronations and is maintained operational.
Harry Powell spent his entire career as a coppersmith at the Crewe factory. To satisfy a demanding customer, he made a 1/8 scale model of the Duchess of Buccleuch, number 6230, and of its tender by reusing the works drawings.
This 7 1/4 inch gauge 2.87 m long model is accurate in every detail including crimson exterior color, maroon livery, inscriptions, wooden floor, sliding door, copper boiler and all pieces of equipment. This realization, delivered around 1970, required 18,000 hours of work over ten years. The commissioned model of the 6230 was sold for £ 170K including premium by Dreweatts on April 25, 2012.
Another identical model of the Duchess of Buccleuch had been prepared at the same time by Powell, probably for his personal use. It is estimated beyond £ 100K for sale by Dreweatts at Donnington Priory, Newbury, Berkshire, on March 12, lot 23.