The Term "COPO"

[Unreal]

That was a great explanation by Jim and Joe. One thing I am unclear about, though.

Did the boys at Central Office use the term "coh-poh" when referencing any of the cars that were ordered through the COPO process?
I understand the point about COPO9561AA or whatever, showing up on the paperwork, but that does not mean that back then, they were referred to as "co-pohs". Most cars were ordered through the RPO process, and RPO showed up on the paperwork, but I've never heard of them referred to as "Ar-pohs" or "Ar-pee-oh's"