A red signal shows brightly at the intermediate at milepost 14.5 along very quiet rails. The Moffat is out of service and shutdown for daylight maintenance. All of UP's signals have been approach lit on the Moffat, meaning the signals are dark until a train is approaching. However, since this maintenance window started, the signal have all remained on. Why? I don't have an answer!
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Posted By Chris Schellhase On Tuesday, November 6, 2018 At 5:13:15 PM (PT)
It has to do with the PTC system protecting the MOW crews. PTC is supposed to protect train movement through signals regardless of what is occupying the track. MOW crews typically cannot trigger occupancy for signals meaning that the dispatcher changes the signal aspect to red once track and time has been granted.
