Steam Memories

Standard Class 4 4-6-0 75029 'The Green Knight' is a class of BR steam locomotives, 80 of which were built during the 1950s. Six have been preserved.

 

 

Introduced in 1951, they were designed for mixed traffic use on secondary routes where the otherwise ubiquitous BR standard class 5 and their predecessors, the Black Fives, would be too heavy. They were essentially a tender version of the standard 4 2-6-4T, with similar characteristics to the GWR Manor Class, though unlike the Manors they were built to the universal loading gauge. They used the same running gear as the tank engine (with the leading bogie from the Standard Class 5), and substantially the same firebox, smokebox and boiler, although the boiler barrel was increased in length by 9 inches (23 cm).

 

The class was initially allocated to the London Midland Region (45) and the Western Region (20). The last 15 were allocated to the Southern Region. The Southern batch were built with BR1B tenders, which weighed 49.15 long tons (49.94 t), and carried 4,250 imp gal (19,300 l; 5,100 US gal) of water and 7.00 long tons (7.11 t) of coal. This reduced their route availability to 7, the same as the Standard Class 5.

 

The engine weighed 67.90 long tons (68.99 t), was 60 ft 0 in (18.29 m) long, with 5 ft 8 in (1.727 m) diameter driving wheels. It had two cylinders of 18 inches (457 mm) diameter and 28 inches (711 mm) stroke operated at maximum boiler pressure of 225 lbf/in² (1.55 MPa), to produce 25,515 lbf (113.5 kN) tractive effort. Its British Railways power classification was 4MT.
It normally used the standard BR2 or BR2A tender, which weighed 42.15 long tons (42.83 t) and carried 3,500 imp gal (16,000 l; 4,200 US gal) of water and 6.00 long tons (6.10 t) of coal. In this configuration its route availability was 4, almost universal over the British Railways network.

Many thanks Wikipedia. http://www.nymr.co.uk/