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Metro is apologizing for the delays and inconvenience caused by the heat wave.
The near 100-degree temperatures was not just hard on riders, it caused equipment to warp - causing delays on the Red Line Tuesday afternoon.
Trains were single-tracking between Takoma Park and Forest Glen due to what Metro called a "heat kink." That's when the heat causes metal on the tracks to expand, preventing trains from running safely. Riders experienced delays going in both directions.
Crews were on the tracks last night to bring the warped tracks back into proper alignment.
By Wednesday morning, the Red Line was clear.