Curtis Hill, Oklahoma is still a major bottleneck on BNSF's former Santa Fe transcon between Chicago and Los Angeles. The east slope of the hill was double tracked in 1995, the west side is currently being double tracked, but there is still the single track over the Cimarron River. Curtis Hill is also the location of the longest continuous curve on the former Santa Fe between Chicago & LA. Loads of action, with fleeted trains, lots of different power. Taped in May, 2004.