Health officials are warning the public about a potential measles exposure on an Amtrak train to Washington, D.C. and at a health clinic in the city, and noted that those who have not yet been vaccinated are at risk for catching the virus.

Amtrak discovered corrosion on a number of its Horizon rail cars across the country during a routine inspection, the company reported Wednesday

Corrosion was found in several railcars used on Amtrak's Borealis — the 7-hour and 24-minute train line from the Twin Cities to the Windy City.