The Pennsylvania Railroad ignitron-rectifier locomotive

Continued and intensive developments in perfecting the ignitron rectifier for broad application in the industrial and power fields revived interest recently in using it for railway work. Extensive tests in the laboratory and on an experimental railway car have demonstrated that a locomotive using ignitron rectifiers offered promise in combining the best features of the a-c and d-c electrification systems. The features of two such locomotives built for the Pennsylvania Railroad are described in the following paragraphs.