Hmmm, I'm thinking that you'd be the one person here that would know the answer,
so this must be a quiz. I know that CN operated a bunch of RSC-13s and -24s, and some "kitbashed" RSC-14s, probably the last Class 1 with this axle configuration. Beyond that, I'm lost.
I'll hazard a couple of guesses, though: Kennecot Copper, DMIR, and/or GB&W - the first 'cause it sprang to mind (proving that an empty mind can be a dangerous thing
:twisted: ), the second when I realised that my mind wasn't totally empty,
and the third because it was all-Alco for so long.
Wayne