Union Pacific and Norfolk Southern are in merger talks to create the largest railroad in North America that would connect the East and West Coasts.

Atlanta-based Norfolk Southern confirmed on Thursday that it is in merger talks with Union Pacific. The merger between two of the country’s major freight railroads would create a single U.S. railroad with service stretching coast-to-coast.

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