7S-007-015 O Gauge Class 57xx Pannier `GWR' Green 5762The 5700 class were introduced in 1929, whilst the 8750 class followed in 1933 and by 1950 863 locomotives had been constructed, making this perhaps the most successful 0 6 0. G. W. R. Classification: Group C, Route Blue, changed to yellow under B. R. B. R. Classification: 3F. Designed for shunting and short freight workings, however it soon became clear that other duties could be performed such as branch passenger working and mainline freight, being