The BNSF/UP Joint line runs from Denver, CO to Pueblo, CO, with trains from both railroads running between the two cities. The line is dispatched by both the BNSF and the UP. The joint line begins as a triple track railroad at milepost 3.6 in South Denver through milepost 12.2 in Littleton, and then becomes a double track (though largely separated railroad) to milepost 52 at Palmer Lake. From Palmer Lake to Crews, milepost 84.4 the railroad is single track, with passing sidings at Monument, Academy, Colorado Springs, and Kelker. This single-track railroad can at times create a major bottleneck to operations. From Crews, milepost 84.4 to Bragdon, milepost 108.6, the railroad is again a separated double track line. Track 1 refers to the west most track, and generally is used for southbound trains. Track 2 refers to the eastern most track, and generally is used for northbound trains. Primary traffic on the joint line are BNSF and UP Coal trains, with coal loads usually running south and empties returning north, though some merchandise traffic is run. Pushers are still occasionally used, but DPU has largely replaced the pushers. If you like Main Line Railroading in Colorado, This is a Perfect Addon for Train Simulator.