The tally of cracked rails on Metro increased Monday, with another crack found on the Red Line.

The Washington Examiner reported on Monday that the transit agency had found 26 cracked rails for the year so far. But just hours later, another crack slowed down service near Friendship Heights, bringing the total to 27.

That's more than one every two weeks.

Metro sent out an alert to riders just before 11 a.m. about the latest track problem. Trains shared a single track until 2:24 p.m. between the Medical Center and Van Ness-UDC stops while crews made repairs, said Metro spokesman Philip Stewart.

The crack is close to another one found Thursday near the Bethesda station, both occurring in underground areas.

The tally for 2012 is lower than last year's 49 cases, but the cracks delay riders when crews need to make such emergency repairs and are a major safety hazard that can lead to derailments.