Passenger competition
Families increasingly owned automobiles, highways improved, and commercial aviation became faster and more accessible for long-distance trips. Railroad passenger ridership declined.
Freight competition
Trucks offered flexible door-to-door service, especially for shorter distances and time-sensitive freight. Rail retained major advantages for many heavy and long-haul movements.
Financial pressure
Some railroads struggled with declining traffic, aging infrastructure, restrictive regulation, and high fixed costs. The Northeast experienced especially severe railroad financial problems.
Restructuring, not disappearance
The industry ultimately changed rather than vanished. Mergers, deregulation, technology, intermodal traffic, and new operating practices produced a different freight-rail system.