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At the East Portal, there is a gate, or "curtain", that raises when a train approaches and lowers after the train passes. This is part of a ventilation system for the tunnel. However, I have heard that since the UP takeover of the former Rio Grande trackage, that traffic on the line has increased to the point where the door is left constantly open. I'm sure that it is controlled automatically by CTC. It opens and closes like a garage door, rolled up and down from the ceiling. The wires that lead into the tunnel probably go to the telephone safety stations inside the tunnel. Others, most likely concern radio transmissions for trains while in the tunnel. I'm not quite sure about the air noise. The door at the East Portal used to be red and white striped. I'm not sure what color is is now. Probably black. The tunnel was completed in 1927, and is exactly 6.21 miles long, a straight bore. Before its completion, the railroad twisted its way up to eleven thousand feet, where it crossed the continental devide at Rollins Pass. The old grade also included a loop at Rifle sight notch, on the East side of the Summit.
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