Thank you very much! I guess I didn't connect the B diagram with the RFFSA units without the '12' on the diagram.
Variants do apply, as there is a separate section for them. I'll start a new thread in the General Discussion: Locomotives and Equipment forum tomorrow with the current list.
The R is certainly an interesting beast! It seems to be a slimmed-down GP18 with a one-piece radiator assembly as opposed to the two separate sections on the GP18. Thanks a lot, these original documents are a real treat.