A Pennsylvania Railroad Budd Metroliner exceeds 249 kilometres per hour (155 mph) on their New York Division, also present-day Amtrak's Northeast Corridor.

The Pennsylvania Railroad, legal name as the Pennsylvania Railroad Company, also known as the "Pennsy," was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. At its peak in 1882, the Pennsylvania Railroad was the largest railroad, the largest transportation enterprise, and the largest corporation in the world.

The Budd Metroliner was a class of American electric multiple unit (EMU) railcar designed for first-class, high-speed service between New York City and Washington, D.C., on the Northeast Corridor. They were designed for operation up to 150 miles per hour (240 km/h): what would have been the first high speed rail service in the Western Hemisphere. Although 164 mph (264 km/h) was reached during test runs, track conditions and electrical issues limited top speeds to 120 mph (190 km/h) in revenue service. The single-ended units were designed to be arranged in two-car sets, which were in turn coupled into four to eight-car trains.

The National Railroad Passenger Corporation, doing business as Amtrak, is the national passenger railroad company of the United States. It operates intercity rail service in every contiguous U.S. state except for Wyoming and South Dakota as well as three Canadian provinces. Amtrak is a portmanteau of the words America and track.