Dark clouds begin to fill the afternoon sky as BNSF H1 Dash 9-44CW #970 leads a sand train into Leyden Siding on the UP Moffat Tunnel Subdivision on August 5th, 2019.
A UP coal train descends through the Big Ten curve area below Clay siding. Unit 6825 is the rear DPU. The front of the train is entering Rocky siding area below Big Ten.
A UP coal train descends through the Big Ten curve area below Clay siding. Units 6851 and 6061 are mid-train DPUs helping to control the speed of the train.