UP 4161 (SD70M) and its MOW train holds position while a Herzog vehicle checks the main line adjacent to the UP's North Yard in Denver.

UP 4161 (SD70M) holds next to the North Yard while MOW equipment moves down the track.

An SD70M, AC6044CW, and SD40N lead the North Yard, CO to Grand Junction, CO manifest through Coal Creek Canyon west of Denver as the rain continues to fall.

Rain, fog, and wheel slip. That pretty much sums up of what's happening here. An SD70M, AC6044CW, and SD40N lead the North Yard - Grand Jct manifest as they climb the grade at Big Ten Curve.

Northbound climbing Swanwood Hill.