I've been watching #15 a few times this year and I've got a few questions. First , I should say that I operated a GE 90 ton center cab at Shideler Grain in Indiana for 9 years. The loco at the grain elevator would be a big brother to #15. My guess is that #15 has 2 engines, one under each hood.
The last time I saw #15 operating in the yard, she seemed to be running on only one engine. At the same time it sounded that one cylinder on that engine wasn't firing. The cylinder thing appeared to never clear up. Was I dreaming that day? Is she really sick?