Name that company

A leading transportation company, I run the largest railroad in North America, covering 23 states across two-thirds of the United States. I link every major West Coast and Gulf Coast port and provide service to the East through my major gateways in Chicago, St. Louis, Memphis and New Orleans. I boast 33,035 route miles, 47,000 employees, 7,094 locomotives and 90,877 freight cars. I’m America’s largest chemical hauler, and General Motors is my second-largest customer. I transport more than 240 million tons of coal per year. Based in Omaha, I rake in $12 billion annually. Who am I?

Last week’s answer: Washington Post Co.