Paul Decauville (1846–1922) was a French pioneer in light railways. His major innovation was the use of ready-made sections of light, narrow gauge track fastened to steel sleepers; this track was portable and could be disassembled and transported very easily. The first Decauville railway used 400 mm (153? 4 in) gauge; Decauville later refined his invention and switched to 500 mm (1 ft 73? 4 in) and 600 mm (1 ft 115? 8 in) gauge.

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