On a crisp Memorial Day morning, the westbound Zephyr is on time just east of Cliff. The California-bound train is passing through the last tunnel in the Tunnel District (when heading west), tunnel 29. This also happens to be the shortest tunnel in the Tunnel District at only 78 feet in length. The train is about to cross South Boulder Creek as it approaching a clear signal at East Cliff, about 36 miles west of Denver Union Station.
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