CNNのインスタグラム(cnn) - 1月31日 01時49分

Sub-zero temperatures in Chicago forced rail crews to heat up some of the city's commuter tracks with fire to ensure trains can run smoothly. The extreme cold can cause metal to shrink, which makes some rail connections separate and cause defects. On Wednesday morning, temperatures in the Windy City were about 22 degrees below zero, with a bitter wind chill. About 72% of the continental US population—some 212 million people—will see temperatures drop below freezing this week.

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