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By means of a thermostat. quotations examples
[...] the electric fan drive and Drayton regulator temperature control employed on the prototypes have been superseded on the production version by Serck-Behr hydrostatic drive from an engine-driven pump with thermostatically controlled fan speed regulation.
1960 June, “The N.B. Loco. Co. diesel-hydraulic Type "2" locomotive”, in Trains Illustrated, page 345