The Longmoor Military Railway (LMR) was a British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 military

Military

A military is an organization authorized by its greater society to use lethal force, usually including use of weapons, in defending its country by combating actual or perceived threats. The military may have additional functions of use to its greater society, such as advancing a political agenda e.g...

 railway in Hampshire

Hampshire

Hampshire is a county on the southern coast of England in the United Kingdom. The county town of Hampshire is Winchester, a historic cathedral city that was once the capital of England. Hampshire is notable for housing the original birthplaces of the Royal Navy, British Army, and Royal Air Force...

, built by the Royal Engineers

Royal Engineers

The Corps of Royal Engineers, usually just called the Royal Engineers , and commonly known as the Sappers, is one of the corps of the British Army....

 from 1903 in order to train soldiers on railway construction and operations.
Authorised for construction from 1902, activities date from 1903 when a gauge tramway was laid to assist in removing seventy corrugated iron huts from Longmoor Military Camp

Longmoor Military Camp

Longmoor Military Camp is a British Army training camp and training area on the A3 road between Liss and Liphook in Hampshire, England. The village of Greatham lies to the south....

 Camp to Bordon

Bordon

Bordon is a town in the East Hampshire district of Hampshire, England. It lies 5.4 miles southeast of Alton and forms a part of the civil parish of Whitehill, the adjoining village. Both settlements are on the A325 road and close to the A3 road between London and Portsmouth...

.

The railway was relaid to standard gauge

Standard gauge

The standard gauge is a widely-used track gauge . Approximately 60% of the world's existing railway lines are built to this gauge...

 in 1905–1907 and was initially known as the Woolmer Instructional Military Railway.