A power failure stopped the A-line to Denver International Airport Monday morning.
RTD-Denver tweeted at 4:41 a.m. that the A-line was down.
Power was restored about 30 minutes later.
RTD-Denver tweeted that passengers should expect delays as service was restored.
There's no word yet what caused the power failure.
The University of Colorado A-line started operations April 22.
In addition to power problems on the line, RTD was ordered to staff each crossing around the clock, to help direct traffic in the event of a signal malfunction.
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