Berlin Mills Railway 7 is a steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 at Steamtown National Historic Site

Steamtown National Historic Site

Steamtown National Historic Site is a railroad museum and heritage railroad located on in downtown Scranton, Pennsylvania, at the site of the former Scranton yards of the Delaware, Lackawanna and Western Railroad . The museum is built around a working replica turntable and a roundhouse that is...

. It was built in 1911 by the Vulcan Iron Works for the Berlin Mills Railway, an industrial line in Berlin

Berlin, New Hampshire

Berlin is a city along the Androscoggin River in Coos County in northern New Hampshire, United States. The population was 10,051 at the 2010 census. It includes the village of Cascade. Located on the edge of the White Mountains, the city's boundaries extend into the White Mountain National Forest...

, New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

. Number 7 worked there as a switcher until November of 1944, when it was sold to the Groveton Papers Company of Groveton, New Hampshire

Groveton, New Hampshire

Groveton is a census-designated place in the town of Northumberland in Coos County, New Hampshire, United States. The population was 1,118 at the 2010 census. It is located at the intersection of U.S...

. In 1956, it was finally replaced by a diesel locomotive, ending 45 years of use. After a few years of idleness, though, the locomotive was leased to the Woodsville, Blackmount and Haverhill Steam Railroad, a new tourist railroad

Heritage railway

thumb|right|the Historical [[Khyber train safari|Khyber Railway]] goes through the [[Khyber Pass]], [[Pakistan]]A heritage railway , preserved railway , tourist railway , or tourist railroad is a railway that is run as a tourist attraction, in some cases by volunteers, and...

 near Haverhill

Haverhill, New Hampshire

Haverhill is a town in Grafton County, New Hampshire, United States. The population was 4,697 at the 2010 census. Haverhill includes the villages of Woodsville, Pike, and North Haverhill, the historic town center at Haverhill Corner, and the district of Mountain Lakes...

. Number 7 operated as the only locomotive for this company until it folded after 1963. It was ultimately donated to Steamtown by the Groveton Paper Company in 1969.