Dan:
If you mean by your question, how did the Q mate the F3's, in fixed sets
or mixed sets? I can give you some information.
The heart of the answer is your time reference. When delivered, the
units remained in fixed consists or sets. As time went on, both
maintenance and operating needs caused the sets to be broken apart and
mixed with other F units. After 1958 or so, I don't have the specific
date handy, the Q began mixing GP and SD type locomotives with F units.
As the second generation of motive power began to replace the first,
more locomotive mixing was done. Just as today, the newer locomotives
were assigned to higher priority trains.
Ed DeRouin
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