A couple GP15's UPY 613 and 637 of Missouri Pacific heritage have there self's a big train today. Going on 42 years old, these locomotives do their jobs, day in and day out. They are working the north end of Salt Lake Cities North Yard, on the Chevron local. The road near by is call warm spring road. Because this is a geothermal area. With springs that make duck ponds, and smell like sulfur. Some day's the smell is worst than others.