Internal disciplinary records obtained by CPR News show engineers have made dozens of serious mistakes in the last two years.
Train to the Plane
The two lines, which opened in 2016, have had significant technical issues with crossing arms that come down too early and stay down too late.
RTD's University of Colorado A Line and its B Line have been granted a 90-day extension to fix faulty crossing gates. People have been stationed at the crossings for months to monitor the gates.