BNSF’s oil trains will go 35 miles per hour in areas with at least 100,000 residents, a 30% reduction in speed in some cases, the company said March 30.

Union Pacific Corp., the largest U.S. railroad by revenue, said it will study BNSF’s actions, while CSX Corp. and Norfolk Southern Corp., the two largest railroads in the eastern U.S., said they aren’t taking similar steps.

Read more here.