Service is back to normal on Metro’s Red Line Wednesday morning after trains were forced to share a track between the Silver Spring and Takoma Stations because of a heat kink in a track.

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Crews worked through the night to fix the problem

Tuesday evening, riders encountered delays and crowded stations throughout the evening rush hour.

“As of 9:30 p.m., crews remain on the scene using heavy machinery to reset the rail to its proper alignment,” Metro said in a statement. “The work continues overnight until the track is able to be returned to service.”

High temperatures can sometimes cause "heat kinks" on the rails.

Heat kinks form when overheated tracks expand and cannot be constrained by the cross-ties and ballast support the track, Metro stated.