Yes, they did, and the 37 is still used all the time up in Portola, CA at the WP RR museum.
The first one is the former Western Pacific #37, originally built for the WP as a Steam Derrick. It was converted by Holt Brothers Equipment (Where Caterpillar was started) to Diesel power in the early 80's soon after the UP/MP/WP merger. My dad was one of the operators on it, and now my brother and I are two if the Derrick's care takers at the museum, hoping to learn to operate it next year. Dad says that second crane in the photos is of a similar one that UP has, and he also ran it, but the 37 was FAR better. We use it at the museum to re-rail equipment on the rare occasion something goes on the ground, and to lift pices during restoration, repair, transport, etc., but is mainly used as a demonstration of large wrecking equipment. If you're interested, I'll ask some of the other members what kind of photo's they have. I just serviced it last month, I wish you would have made this post then, I could have gotten detail photos for you, but I still can late ron if you'd like.