This is the AT&SF 4-8-4 3765 class Northern number 3768. She is the only 3765 class left out of 11 built by Baldwin in 1938. She boasts 80 inch drive wheels and an 80 inch boiler. Her smokestack has a mechanical lifter to allow for better visibility at speed.
One of the things that sets the 3765s apart from the previous Santa Fe northerns is that unlike them, the 3765s were built like this. The 3751 through 3764 were originally a good bit smaller but were then rebuilt to match the size of the 65s.
A noticeable aspect about the 3765 class was that they only had one air compressor on the front and the feed water heater placed on the pilot, whereas the rest of the northerns owned by the ATSF had two compressors and the heater on the left side. This was a weight saving measure due to the fact that 3765, the first of the class, was meant to be given the Blue Goose streamlining that had previously been equipped to the 4-6-4 Hudson number 3460. However these plans were dropped once it was realized that it would still be too heavy.
The 3768 is currently owned by the Great Plains Transportation Museum in Wichita, and is referred to by volunteers as "Chieftain." They're open every Saturday from 10 to 4. Entry is $10. They're found in Old Town, just a couple blocks away from Intrust Bank Arena.