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David Lang had not taken more than half a dozen steps when he disappeared in full view of all those present. Mrs. Lang screamed. The children, too startled to realize what had happened, stood mutely. Instinctively, they all ran toward the spot where Lang had last been seen a few seconds before. Judge Peck and his companion, the Judge's brother-in-law, scrambled out of their buggy and raced across the field. The five of them arrived on the spot of Lang's disappearance almost simultaneously. There was not a tree, not a bush, not a hole to mar the surface. And not a single clue to indicate what had happened to David Lang.
A ventilation system is used to reduce problems with fumes. As a train enters the west portal of the tunnel, doors close on the east portal and huge fans blow in cool air through a second portal to help the diesel engines. As long as the train is within the tunnel, the fans work with reduced power to avoid pressure problems. After the train has left the tunnel, the colored door immediately closes and the fans operate for 20–30 minutes with maximum power to clear the tunnel of exhaust before the next train passes through. In the opposite direction, the door opens when the train is about 1 km (0.6 mi) away from it. The fans are powered by 800 horsepower motors. There are two fans. Over 7 miles of air is moved by a combined 1600 HP fan array. Both fans running can 'clean' the tunnel air within 20 minutes. Present-day train crews carry portable respirators for use in the event of a fan failure or a train stalling inside the tunnel. In addition, there are emergency/safety stations spaced every 1500 and 2500 feet (460 and 760 m) apart, depending on the location within the tunnel, that provide additional air tanks and equipment to be used in the event of a ventilation/other failure.
Originally posted by berkeleygal
When I was 10 I got this book - Stranger Than Science by Frank Edwards (1959) . . . I loved that book and need to get another copy.