of the compound locomotive, and from 1929 on he rebuilt many de Glehn compounds, designed by Alfred de Glehn, with his system of compounding. His other major work included optimising the steam circuit, including improving the steam flow by widening steam passages and paths, improving the flow through valve gear, and improved exhaust systems such as his Kylchap exhaust.

Wheel and rail

Chapelon realised that in

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