Hart Van Denburg/CPR NewsAn RTD commuter rail A Train near the Havana Street crossing on the way to Denver International Airport, July 17, 2018.
Flaggers with orange vests and stop signs have returned to three crossings for the Regional Transportation District's A Line to Denver International Airport.
The Denver Post reports a "safety critical software problem" with gate crossings prompted the agency to place guards back on the line.
The flaggers were removed just over a month ago.
RTD says the guards are a "precautionary measure" while it figures out what's causing the gate software problem.
The Denver Post says the Federal Railroad Administration required guards to return to a number of crossings:
“A safety critical software problem was identified in the wireless activation system for all 13 crossings on the G-line and three crossings on the A-line and one crossing on the B-line,” FRA spokesman Marc Willis said Monday in a statement. “The FRA has required RTD use crossing attendants at those crossings until the issue is resolved.”
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