After meeting a Provo-Denver here at Rocky, the Zephyr has already accelerated back up to track speed as it blasts through the OS at the west end of Rocky. Union Pacific gives IDs to all control points, in addition to names. As you can see, the control point ID here at West Rocky is "CP DS019". The "DS" comes from "Denver and Salt Lake", David Moffat's railroad that built the line well over a century ago.
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