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the antenna and wires are repeaters for the rear end devices and the DPU's, also a radio repeater. <br />the air sound was probably the sound of the exhaust fans but I'm not certain that is what it is. <br />there is a door at the east end. It is there because as the train goes into the tunnel it acts like a piston, driving out all the air in front of it and of course leading to lot's of problems. As you read in some of the other answers, there are huge blowers that blow out accumulated exhaust gases from the tunnel, these are on from the time the train enters until 20-30 min after each train. they work in conjuntion with the curtain to ensure enough fresh air in the tunnel for the crew and the engines to work. As to the activation of the curtain, it is tied in with the signal system like an interlocking, if the curtain doesn't work the crew gets a red signal and has to stop until they can get the curtain up. <br />Also, one of the other replies said something about the tunnel being straight, this is true, but it is not level, the peak of the climb is in the approxamite middle of the tunnel, thus you can't look in the west end and see one comming westbound until it clears the summit of the grade. <br />This tunnel is the primary limit on the number of trains they can run due to the amount of time between trains that it takes to clear the tunnel of exhaust gases. The UP upgraded the fans a few years ago, decreasing the amount of time it took to clear somewhat, but they are about maxed out on how fast they can get the exhaust out.
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