I was in the same boat as you for the longest time MeowRailroad. I wasn't interested too much in the Union Pacific for the longest time, however recently I've had a change in heart. The history, the challenges and of course the steam locomotives make the Union Pacific so much more attractive than it was previously. Recently I've become fascinated in the history of the UPs large articulated steam power, not just the already famous Challengers and Big Boys, but also 2-8-8-2 UP's ex-N&W Y3s and 2-8-8-0 Bull Mooses. I also am interested in their smaller motive power, namely the MK-series Mikados, P Type Pacific's and the large Mountains. I don't feel the staple locomotives get enough attention so I've been trying to recreate them in Trainz as well as making more Challengers and Big Boys. I'm planning on using all my photo reskined engines for a large YouTube project later on so look out for that too.