Mount Washington Cog Railway

Mount Washington Cog Railway
Track with rack
Overview
Locale	Coos County, New Hampshire, U.S.
History
Opened	1868
Technical
Line length	3 miles (4.8 km)[1]
Rack system	Marsh rack system
Track gauge	4 ft 8 in (1,422 mm)
Route map Legend Mount Washington summit Appalachian Trail Skyline siding(removed) Waumbek station and passing loop Marshfield station Boston & Maine Railroad to Fabyan (removed)(Carroll) locomotive depot This diagram: view talk edit

The Mount Washington Cog Railway, also known as the Cog, is the world's first mountain-climbing cog railway (rack-and-pinion railway). The railway climbs Mount Washington in New Hampshire, United States. It uses a Marsh rack system and both steam and biodiesel-powered locomotives to carry tourists to the top of the mountain. Its track is built to a 4 ft 8 in (1,422 mm) gauge, which is technically a narrow gauge, as it is 1⁄2 inch (13 mm) less than a 4 ft 8+1⁄2 in (1,435 mm) standard gauge.

It is the second steepest rack railway in the world after the Pilatus Railway in Switzerland,^[2] with an average grade of over 25% and a maximum grade of 37%. The railway is approximately 3 miles (5 km) long and ascends Mount Washington's western slope, beginning at an elevation of approximately 2,700 feet (820 m) above sea level and ending just short of the mountain's summit peak of 6,288 feet (1,917 m). The train ascends the mountain at 2.8 miles per hour (4.5 km/h) and descends at 4.6 mph (7.4 km/h). Steam locomotives take approximately 65 minutes to ascend and 40 minutes to descend, while the biodiesel engines can go up in as little as 36 minutes.

Most of the Mount Washington Cog Railway is in Thompson and Meserve's Purchase, with the part of the railway nearest to Mount Washington's summit being in Sargent's Purchase.