The broken Metro rail that caused delays Wednesday morning was caused by the sudden drop in temperatures but has been repaired in time for the evening rush hour, transit agency officials said.
"It's common whenever there's a severe swing in the temperature because the rails are metal," said Metro spokesman Dan Stessel.
Reports of the cracked rail on the Yellow line began at about 7 a.m., prompting Metro officials to warn commuters of a 20- to 30-minute wait. Blue line service also was significantly delayed.
Track workers found and replaced a 4-inch crack in the rail, near the Pentagon station, and fixed a small crack in a Red Line rail.
Trains were operating on a normal schedule again by 10:20 a.m.
Mr. Stessel also said the Long Island Rail Road had a similar type of problem this morning.
Washington-area temperatures dipped into the low 20s overnight and were still in the 30s by the early afternoon.
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