chnhrr wrote:Thanks Noel for the information. I will take a look at my copy of NH Power. I assume that the three connection points were for different uses (i.e. power, cab controls etc).
You have to remember that these motors were ancient by today's standards. There were no MU hoses so even with a two or three engine consist there was only one air compressor for the whole train, only one engine brake for the whole train and a host of other situations that were different than what we experience today with MU diesel operations. I never worked on the Westinghouse Motors so I can't detail what use the three connections had but I would assume it was necessary for all three to be connected in order to have proper MU operation.