Reply to "Mixing Diesels in MU Consists"

I had a friend who has since passed on.   He was a New York Central buff and knew guys that worked for the NYC.    They told him that NYC did not mix different mfg diesels for the first 15 years or so until they went in for rebuilds.   The reason was that the MU connections were incompatible as built.   When the units went in their first major overhauls, the NYC changed them.   

So if you model early diesel or transition era, at least on the NYC, you should not mix builders units in the same lashups.    You could mix EMDs of different models, but not Alcos with EMDs for example.