Looks like the hood of an RS18 or RS10 trailing that FP7 on the back track. I wonder what train it was on? I’ve seen lots of shots of that arrangement on the lead of the Canadian but to be honest I’d really like to hear it was on the lead of the commuter train headed in the opposite direction.
Thanks to some excellent detective work as noted in the Comments attached to this post, the mystey trailing MLW is an RS10. Great points Chris, thanks for sharing them.