Here I am again. Jumping all around here to bring you interesting and entertaining Railfanscajonpass videos! I am perched way up here at mile post 65 at Sworthout Canyon. We get a fantastic great look at this super Union Pacific manifest train with a wide assortment of amazing rail cars. Traveling down main track 3 westbound. Five power units up top, a mid and trail DPU makes 7. I’m not sure how many were actually working but I do know the last one was chugging smoke in dynamic mode. Today, diesels use their tractive effort to help move a train up one side of a hill, and dynamic braking to ease it down the other side. Indeed, in some spots like Cajon Pass in California, rules are in place to prevent a train from starting downgrade unless it has a specified number of units with functioning dynamic brakes.
![](https://s2.save4k.ru/pic/qrbD58HzNZE/maxresdefault.jpg)