NREX B units

Huh? I’ve always heard that they were the same. [?]

I beg to differ, I recall UP putting the “B” at the beginning of the number, e.g. UP B3434.

Yep, Chris had it right, they got 'em from NS. They ran around in black for a while, with “CP Rail” on the sides, just like the white ex-KCS SD40-2s they bought around the same time that ran around with red “CP Rail” on the sides for a while. Most of these ended up in the DualFlags paint scheme, like sister unit 5478 that I got a pic of in Milwaukee last year:
www.geocities.com/fuzzybroken/TC5.html (scroll to the bottom of the page)

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Yes, the Tunnel Motor is on a longer frame, approaching the length of a SD50 or 60. The SD45-2 is on the same frame as a