The signal on the main at the east end of Plain is showing a clear (green) aspect for BNSF's Provo-Denver, which is currently at Tunnel 4. Early in the 21st Century, UP gave all control points a designation for use when issuing track and time, flagging past red signals, etc. The east switch of Plain is CP DS024. The "CP" is short for "Control Point". The "DS" designation comes from "Denver & Salt Lake". The "024" indicates this control point is near milepost 24.
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