The Union Pacific puts on a colorful show as it races across Arizona. It’s post-merger and it’s all change in Arizona! In the motive power department, anything goes on UP’s former SP “Sunset Route” these days, from brand new SD90MACs to scruffy tunnel motors, CNW C44s to an SP SD7, SP ACs to elderly C36s. Yep, UP puts on quite a show in the magnificent scenery of southern Arizona, from Steins on the New Mexico border all the way to Yuma on the California border. Trains slog up the mountains and race across the desert. From coal trains to double stack – it’s all action on the Sunset Route!