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At the end of WW1 Simplex experimented with a slightly modified armoured Simplex loco on a tandard gauge chassis. After WW1 they simplified th body, creating a very open cabbed loco. It found use on both industrial and mainline railway systems. Alternative enclosed cabs offering more room were later either provided as standard, or were added by companies themselves. Many suurvived in to BR days, and examples of various types are preserved.
This is based on the original open type. There were many minor differences in locos,such as seats and fuel tank, so this is more more generalised version.