Simplified Speed Control for Single-Phase Locomotives

Particular reference is made in this paper, to a recently developed, greatly simplified control system for high-voltage, single-phase locomotives, where the entire heavy and bulky switch-gear is replaced by a simple high-voltage tap changer. A short description is also given of various other control systems which are today used on electric single-phase locomotives, and the strong and weak features of such systems are discussed. No reference is made to control systems for split-phase or motor-generator locomotives.