DSGDDR is currently working on this ALCO 4-12-2 The video was released about 2 hours ago. Built between 1926-1930, this unusual locomotive had a 3rd cylinder located between the frame rails. Watch the video and look at the detail. The release date is not mentioned yet.
Video here: https://www.youtube.com/watch?v=T7_QW40-8uk
More locomotive details here: https://en.wikipedia.org/wiki/Union_Pacific_9000_Class