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DENVER — The Federal Railroad Administration and RTD say the A Line and the B Line have another 90 days to operate with human flaggers while crossing gates are being fixed.

RTD said the gates have been closing too early and opening too late. RTD submitted its plan for a fix to the RTA.

A similar federal waiver could be granted to the G Line. All three lines use the same software for grade crossings.

The FRA has been allowing RTD to run the A Line and B Line under a waiver that requires them to use human flaggers as a safety precaution.

RTD’s current waiver for both lines was due to expire Sunday.