Union Pacific, the largest U.S. freight railroad operator, is exploring a possible acquisition of Norfolk Southern to create a $200 billion coast-to-coast rail network, a person familiar with the matter said.

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.

Two railroad companies could be trying to put a deal into loco-“motion.” Union Pacific and Norfolk Southern have started to examine the possibility of a merger, according to a report from the Wall Street Journal,