When the Moffat route was originally built and the railroad was faced with Rock Creek Canyon, there were two options. Build a roughly 1,800 foot long bridge across the canyon, or build back into the canyon roughly a mile in and back out, where a fill and four tunnels could facilitate the journey. The railroad chose the latter option. The westbound Phippsburg Local has just completed that journey in and out, and is now continuing west toward Phippsburg.
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