The nation’s freight railroads are going to be able to try relying more on technology and inspect their tracks less often after the federal government approved their waiver request on Friday.

The nation’s largest railroad union endorsed Union Pacific’s proposed $85 billion acquisition of Norfolk Southern Monday after securing promises to protect jobs.

Another railroad union has rejected its agreement with the nation’s freight railroads.

The U.S.'s third largest railroad union rejected a deal with employers Monday, renewing the possibility of a strike that could cripple the economy.