Two in Tandom

Locomotive No.5199
In 1938, the GWR began a modernisation programme to the earlier locomotives, rebuilding them to provide greater availability and more tractive effort. This would allow them to undertake their original mixed-traffic duties on a wider selection of routes, as well as banking. The 3100 class were to be rebuilt as the 3500 class, with Standard Class 4 boilers at 225psi replacing the original Standard Class 2 at 200psi, and using coupled wheels of 5 feet 3 inches diameter, which in combination took tractive effort up to 31,170 pounds. Only five engines were rebuilt pre the onset of World War II. The last of the large prairie locomotives constructed were 4140 to 4179, built to the last GWR design by British Railways at Swindon.
Locomotive No 7714
The Great Western Railway (GWR) 5700 Class, or 57xx class, is a class of 0-6-0 pannier tank steam locomotive, built between 1929 and 1950. 863 were built, making them the most prolific class of the GWR, and one of the most numerous classes of British steam locomotive,

Although officially designated by GWR as "light goods and shunting engines", they were also used for passenger working on branch, suburban, and shorter mainline journeys.

They were distributed across most of the GWR network and, after nationalisation of the railways in 1948, across the British Railways Western Region, and also other regions.

The 5700s were not as glamorous as the GWR Castles and Kings, but became just as much of an icon of the GWR.

As a result of the 1955 Modernization Plan, the 5700 Class was withdrawn from BR service between 1956 and 1966. Nineteen withdrawn locomotives were sold to London Transport and industry, of which ten were later preserved, along with six that were retrieved from scrapyards.
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