Signs at the Forest Glen Metro stop alerted riders to outages and delays on Sunday. (Katherine Frey/THE WASHINGTON POST)

The transit agency has scheduled extra employees to deal with any unforeseen problems and avoid additional service disruptions.

The first system shutdown happened Saturday afternoon and lasted about 40 minutes. The second began about 12:30 a.m. Sunday and lasted until about 1 a.m.

The root of the computer failures is still a mystery and remains under investigation, Metro officials said.

So far on Monday morning, there are no reported delays, computer glitches or other problems on any Metro lines.

Stay with Dr. Gridlock for updates throughout the morning commute. Share what you’re seeing on the rails in the comments below or via Twitter (@drgridlock).