The combination of two large rail companies would create the first coast-to-coast network, but the deal could reduce competition.

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 Corp., North America’s largest railroad, is in advanced discussions with Norfolk Southern Corp. about a potential tie-up in what would be the industry’s largest deal ever.Union Pacific has a market value of about $135 billion,