DENVER -- Passengers on the train to Denver International Airport were delayed again Tuesday morning.
RTD-Denver tweeted at 7:06 a.m. that the CU A Line was experiencing delays of 20-30 minutes. The issue was resolved around 8:54 a.m.
On RTD's website, officials said the issue was "operational difficulties," but they didn't explain what the difficulties were.
A Denver7 viewer said his train was stopped at the 40th and Colorado station.
This is the second time this week and the fourth time this month that the A line has had trouble.
There were delays of more than an hour in both directions on Sunday because of an electrical issue.
There were also delays on July 1 and 5.
There have been multiple delays and problems with the A-line since it opened at the end of April.
The worst was in May when Denver firefighters had to help evacuate some 80 passengers after a train lost power on a bridge 50 feet above the ground.