A bit of trivia: see that train coming across the bridge? He’s got a very precise maneuver ahead of him. He’s faced with the challenge of keeping just the right amount of speed as he comes across the bridge. Why’s that? I’ll elaborate.
As a train leaves Mandan and heads east, it begins an uphill journey. The track climbs as it runs parallel to “the Strip” and meets up with the Northern Pacific Bridge. As far as I know, the bridge is level…but the track takes a hard right turn almost as soon as it hits solid ground. That means that the train has to be going slowly enough to make the turn safely, but fast enough to keep momentum as it drags its load up the incline!
When I worked for the Harley-Davidson shop on the Strip (okay, so I still do) I would occasionally watch trains as they went past the back of our shop. Sometimes an especially long or heavy train would go by, slowly losing speed, until it was almost imperceptibly creeping up the incline. Then, as if that last little thread of traction finally broke, the cars would slam as they gave up their forward momentum. Then the train would creep slowly backward into Mandan and take another run at it. Sometimes they’d get a helpful push from the yard locomotive, other times they’d just try to carry a little more speed. This only happened on wet or snowy tracks, by the way.
I hope you enjoy this photo of the frost-glazed NP bridge and the railroad story. If you have the opportunity to watch a train come across in wet or snowy weather, watch and see if they make it on the first try!