The crew on this westbound oil empty is prepping for 12 to 15 minutes of darkness as the train will pass beneath the Continental Divide in the 6.2 mile long tunnel. There is actually a lot of infrastructure here at East Portal, built to ventilate the tunnel from exhaust between trains. The tunnel itself (within the mountain) starts several hundred feet back. On a side note, you can see water spilling out of the Moffat Water Tunnel, transported to the east slope from the Winter Park area.
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