The westbound Zephyr rounds the bend at the west end of Crescent. The train will pass through a cut before reaching Tunnel 19. The cut is protected along the sides and even over the top by a slide fence. If rocks fall, the wires will help deflect them from the track. If the rocks are large enough to break through the fence, signals will automatically drop to red, the dispatcher is informed, and an automated message is broadcast over the radio on the road channel.
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