Narrow gauge railroads in the United States

Standard gauge was favored for railway construction in the United States, although a fairly large narrow-gauge system developed in the Rocky Mountains of Colorado and Utah. Isolated narrow-gauge lines were built in many areas to minimize construction costs for industrial transport or resort access, and some of these lines offered common carrier service. Outside Colorado, these isolated lines evolved into regional narrow-gauge systems in Maine, New York, Pennsylvania, Ohio, Iowa, Hawaii, and Alaska.

The first narrow-gauge common-carrier railroad was the Billerica and Bedford Railroad, which ran from North Billerica to Bedford in Middlesex County, Massachusetts from 1877 to 1878. There were extensive 2 ft (610 mm) gauge lines in the Maine forests early in the 20th century. In addition to hauling timber, agricultural products and slate, the Maine lines also offered passenger services. The Boston, Revere Beach & Lynn Railroad was a narrow-gauge commuter railroad that operated in Massachusetts. Narrow gauges also operated in the mountains of New Hampshire, on the islands of Nantucket and Martha's Vineyard and in a variety of other locations. The still-operating Edaville Railroad tourist heritage railroad in southeastern Massachusetts is a two-foot narrow-gauge system.

The last remaining 3 ft (914 mm) gauge common carrier east of the Rocky Mountains was the East Broad Top Railroad in central Pennsylvania. Running from 1873 until 1956, it supplied coal to brick kilns and general freight to the towns it passed through, connecting to the Pennsylvania Railroad at Mount Union, Pennsylvania. Purchased for scrap by the Kovalchick Corporation when it ended common carrier service in 1956, it reopened as a tourist railroad in 1960. Still owned by the Kovalchick family, trains operate over 5 miles (8.0 km) of the original 33-mile (53 km) mainline. This trackage is today the oldest surviving stretch of narrow-gauge railroad in the United States.

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