Photo By: Kevin Morgan

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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User Comments (1)

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.

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Thursday, October 5, 2017 at 12:44:46 AM
image date



Location Information
City or County and State
Arvada, CO

Subdivision
Moffat Tunnel (UP)

Milepost or Control Point
Chemical (MP 14.5)




Train Information
Railroad
Union Pacific
Model
None
Unit Number
None



Photo Information
Camera Make/Model
Canon / Canon EOS-1D Mark III
ISO
800
Flash
Did Not Fire

Focal Length
24 mm
Shutter
0.03 seconds
Aperture
f/8


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