Union Pacific — which has a market value more than double Norfolk Southern’s — is headquartered in Omaha, Nebraska. But securing federal approval for a railroad merger is no easy task.

Union Pacific’s net worth is $135 billion, significantly more than Norfolk Southern’s $63 billion. There is precedent for a merger after Canadian Pacific joined forces with Kansas City ...

Union Pacific and Norfolk Southern are confirming they're in merger talks that would create North America’s largest railroad, stretching service from East to West Coasts.

Union Pacific and Norfolk Southern are confirming they're in merger talks that would create North America’s largest railroad, stretching service from East to West Coasts.