Following last week's terrorist attacks, Amtrak's business grew 25% and Greyhound's doubled, the companies told CNN.
Last Wednesday through Sunday, more than 400,000 passengers rode Amtrak, an average of more than 80,000 daily passengers. Amtrak's usual daily ridership in September is about 60,000.
Future reservatons for long-distance trains have increased and the service is honoring airline passenger tickets on a seat-for-seat basis.
The number of passengers on Greyhound buses doubled during the same time. In some areas, including Las Vegas and Denver, the number quadrupled.
As of last Sunday, Greyhound reported that ridership was back to normal.