The westbound Denver-Provo is just about to clear the grade crossing at Carr Street. The City of Arvada has installed "quad crossings" and soon this crossing will become a quiet zone as trains will no longer use their horns. The two poles on either side of the train are a high/wide detector. If anything is hanging off the train that won't fit through the tunnels in the Tunnel District, they trip one of the wires, notifying the dispatcher.
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