Running just a few minutes behind schedule, the westbound Zephyr crosses Carr Street in Arvada and also passes through the high/wide detector at MP 8.4. This detector has a wire the runs up, across, and down around the track. The wire is the size of the smallest tunnel. If a car is too large to fit through a tunnel, it'll hit the wire and activate the detector. This ensure no cars will strike the inside of a tunnel.
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