Amtrak's pausing use of its Horizon railcars is disrupting service on its popular Borealis line between St. Paul and downtown Chicago. Why it matters: At least some passengers who booked the 7.5-hour trip will have to travel via bus instead.

The Amtrak Borealis train between St. Paul and Chicago is being temporarily switched to a bus replacement service after workers discovered corrosion problems involving several train cars. A spokesperson with Amtrak tells Bring Me The News routine inspections also found corrosion on Horizon passenger cars on three other lines of service.