Tadman wrote:I would assume then in towing 1100 like CSS recently did it had to be manually reversed as it is the oldest MU around?No. I was referring to "really old" electric MU equipment. The Type M (I think that's it) control on the old South Shore cars (including 1100) isolates the motors from the resistors when no power is applied.
The title of "oldest MU around" -- operating, that is -- goes to CA&E 20, preserved at the Fox River Trolley Museum.