Soo line never owned any C-liners..
the only FM locos they owned were H12-44 switchers.
But other railroad did own C-liners, and yes, they could, and did, MU with other makes and models:
C-liners with an EMD F-units:
http://www.rr-fallenflags.org/nyc/nyc5006ads.jpg" onclick="window.open(this.href);return false;
http://www.rr-fallenflags.org/nyc/nyc5012as.jpg" onclick="window.open(this.href);return false;
http://www.rr-fallenflags.org/nyc/nyc5015ads.jpg" onclick="window.open(this.href);return false;
And here is a C-liner B-unit mixed in with EMD's:
http://www.rr-fallenflags.org/nyc/nyc5103wka.jpg" onclick="window.open(this.href);return false;
although, looking through New York Central photos, it looks like most of the time NYC
preferred to keep FM's with other FM's..probably easier that way..
they *could* MU with other makes, if necessary, but it looks like most of the time they preferred to
keep FM's together..
And yes, B-units could also mix-and match..B-units could mix with any locomotives that an A-unit could..
you could have an EMD or FM A-unit with an Alco FB for example..or vice-versa..
the fact that a loco was a "B-unit" was basically irrelevant, when it comes to MU capability..
typically, a B-unit could mate with any loco that an A-unit could..
Scot