History
Calthrop worked as a locomotive inspector for the Great Indian Peninsula Railway, and in 1886 requested leave to investigate proposals for independent branch lines. He identified two schemes of particular interest – a 5-mile (8 km) tramway connecting the Hindu religious centre of Nasik with the railway, and a 21-mile (34 km) branch line to the town of Barsi. The Great Indian Peninsula Railway approved both schemes, and Calthrop undertook a survey of both lines. In 1887 he registered the Indian Railways Feeder Lines Company in London to promote the construction of feeders to the railway, and began negotiations with the Indian government to build the Barsi Light Railway. The Great Indian Peninsula Railway suggested that he either return to his duties as a locomotive inspector, or resign (with its support) to further promote branch lines. His health was failing, and in 1889 Calthrop resigned from the Great Indian Peninsula Railway. Working as a consultant, he then supervised construction of the 2 ft 6 in (762 mm)-gauge horse-powered Nasik Tramway using his previous survey.
During his time in India, Calthrop developed his ideas on the construction of narrow-gauge railways. He surmised that the axle load on the axles of all rolling stock (including locomotives) could be equal, allowing maximum loading of goods wagons. He settled on a load of 5 long tons (5.1 t; 5.6 short tons) per axle, which was light enough to allow railway lines to be built with 30 pounds per yard (14.9 kg/m) rail. Further, he argued that using a track gauge of 2 ft 6 in (762 mm) was the best compromise between economy of construction and carrying capacity.
Read more about this topic: Barsi Light Railway
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