Credit: Darrow Montgomery

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Red Line riders are having a tough Tuesday after two “track problems” made for troublesome commutes this morning.

With some single-tracking underway, Metro says those passengers should expect “delays [of] up to 45 minutes and crowded conditions” because of an earlier problem. (It had originally estimated 30-minute delays.)

Trains were running with at least 15-minute headways, the transit agency added. Farther north, along a historically troublesome part of the Red Line, riders also experienced half-hour delays and crowding on Tuesday morning due to another track problem at the Medical Center station.

Metro says investigators arrived at the scene shortly after 6 a.m. to inspect the first track issue.