by Herr Spreng
The C-415 was said to be the result of 'market research' or perhaps more accurately,a survey of railroad mechanical personnel.
Three-field was nothing more than an attempt to ape the competition, i.e. EMD's SW-1500. A simple, open loop system a la' the EMD three-field main generator. In this case, GE used their simple shunt field main generator and impressed the complicated field structure on the GY-50 exciter (same as U25/28 DC). After all, the main generator just amplifies the signal impressed upon it.
Obviously, the combination of 8-251 and three-field was completely underwhelming vs. the competition.
Three-field was nothing more than an attempt to ape the competition, i.e. EMD's SW-1500. A simple, open loop system a la' the EMD three-field main generator. In this case, GE used their simple shunt field main generator and impressed the complicated field structure on the GY-50 exciter (same as U25/28 DC). After all, the main generator just amplifies the signal impressed upon it.
Obviously, the combination of 8-251 and three-field was completely underwhelming vs. the competition.