Story highlights High temperatures across much of US will range 10 to 25 degrees below normal

Even colder air mass looks to enter Midwest and Northeast late next week

(CNN) About 100 light-rail passengers got stuck in the cold and dark after a high-voltage power line tumbled onto the tracks as an ice storm hit in Portland, Oregon.

The train inched forward, then stopped several times before the lights went out.

The passengers were stranded at least three hours before firefighters finally could rescue them early Saturday, CNN affiliate KATU-TV reported. No one was injured.

"So we sat there in the dark," passenger Jill Carroll told the Portland station. "It got colder and colder."

It's a sentiment nearly 38 million Americans may well share as a swath of cold air pushes into much of the country.

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