What do you mean by color "transmission equipment?"
Renting production facilities (studio, or remote trucks)? - Possible
National networking? I believe networking was still the monopoly of AT&T in the early days, but maybe some NBC controlled feeds (?).
Local microwave links? - Possible.
There were other souces of production setups besides NBC, notably Red Skelton's company:
https://eyesofageneration.com/camera...ion/rca-tk41c/