A History of the Dowty Marshalling Yard Wagon Control System

Abstract

During the passage of wagons through marshalling yards accurate speed control is essential for high throughput and zero damage to rolling stock and freight. This paper deals with certain aspects of the history of the Dowty system, now installed in fourteen countries and five continents. It describes the novel concept, introduced in the 1960s, of power-operated oil-hydraulic units fitted at intervals to the rail track and operating upon the wheel flanges. Details are also given as to how it developed into the present form, which has the advantages of reduced capital, running and maintenance costs, being worked by the force of gravity alone. For his contribution to the project the author was awarded the Institution's Bramah Medal for 1980.