Union Pacific and Norfolk Southern today announced an $85 billion deal to tie their networks together and create the first U.S. transcontinental railroad. The merged company — which will be called Union Pacific — will transform the U.

The merger would create the United States’ first coast-to-coast rail network, spanning 50,000 miles and 43 states.

Union Pacific and Norfolk Southern said on Tuesday that they have agreed to a merger to create a $200 billion rail giant based on their current market capitalizations.