Persistent troubles with safety gates along the new University of Colorado A-Line have forced transportation officials to station crews with flags for 24 hours a day at all 10 of the at-grade crossings since the airport train opened.

The problems — including gates that drop when no train is approaching an intersection and gates that didn’t fully drop before a train goes through — have been addressed, but the crossings have not yet been certified, the Regional Transportation District says.

For nearly a year before the $1.2 billion rail line opened on April 22, RTD officials knew about the crossing gate glitches, but they were determined to launch the service on time. In addition to flaggers, RTD has put together a rapid-response team — a so-called GO Team — to get to any intersection in less than 20 minutes should an issue arise.

Read more at denverpost.com.

In this undated photo released by the Naval Special Warfare Center shows Seaman James “Derek” Lovelace. Lovelace, a 21-year-old Navy SEAL trainee died last week during his first week of basic training in Coronado, Calif., a Navy spokesman said Tuesday, May 10, 2016. Lovelace was pulled out of the pool Friday after showing signs he was having difficulty while treading in a camouflage uniform and a dive mask, Naval Special Warfare Center spokesman Lt. Trevor Davids said. (Naval Special Warfare Center via AP)

Uncredited