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A Phase 7 P42DC leads the westbound Zephyr across the Carr Street grade crossing and through the high/wide detector at MP 8.4. The detector has a wire suspended around the track. The closest the wire gets to the track matches the closest a tunnel wall (or ceiling) gets to the track. If anything is sticking out too far (or high), it'll break a wire, indicating the car will not clear a tunnel.
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