Gunpowder Railway

The Gunpowder Railway is a 2 ft 6 in (762 mm) narrow-gauge railway running roughly 1 km along the perimeter of the Waltham Abbey Royal Gunpowder Mills site.^[1] During the late 19th and early 20th centuries, an extensive narrow-gauge railway was used to transport materials used in the manufacture of gunpowder around the Gunpowder Mills site. ^[2]

It was reconstructed during 2003–2018 and since 2022 has operated as a heritage tourist attraction.

The earliest known reference to a Railway at Waltham Abbey Gunpowder Mills appears in a 9 January 1856 plan from the RARDE Historical Collection. It details the layout for a new steam-powered gunpowder mill (later known as Group A mill).^[3] The plan shows a raised railway running along the north side of the proposed building and two turntables at the eastern end, positioned near two magazines.

In February 1859, the railway started operating connecting the charcoal mill and gunpowder mixing house to the new steam incorporating mill. Initially it was only about 600 feet (180 m) long, and its function would probably be to convey the loosely mixed ingredients of gunpowder (charcoal, saltpetre, and sulphur) rapidly and safely from the mixing house to the incorporating mill. The railway was constructed using wooden rails to prevent sparks setting off the gunpowder.^[4]

By 1888, the railway linked the gunpowder mixing house with the Group A, C, D, E, and F Incorporating Mills,^[5] and extended to the new canal cut, which terminated by the Group F Mill and its associated magazine and the wooden rails were swapped for steel ones along with the gauge changing from 2 ft 4 in (711 mm) to 18 in (457 mm). Then, in 1889, manufacturing switched to cordite the railway was used to transport the primary ingredients nitroglycerin and guncotton as well.

During World War 1, major changes were required to the narrow-gauge railway to upgrade it to be suitable for lightweight locomotives, and adding interchange sidings with the Great Northern Railway adjacent to the Royal Small Arms Factory.^[6] The upgrades included the use of iron rails^[7] and took the railway to approximately 2 miles (3.2 km) in length.^[8][9]

The factory continued to expand after World War 1, and the manufacture of TNT and RDX was commenced.^[10] This development took the railway to some 3.5 miles (5.6 km) in length with a maximum gradient of 1 in 30 along with the use battery locomotives and briefly 4x petrol/paraffin locomotives.^[11]

Due to the risk of a gunpowder factory being in close proximity to London, manufacture ceased in 1943, and by 1952 the railway link connecting the North and South Sites had been dismantled, but some of the railway and the battery locomotives were still in use in 1954.^[12] Operations ceased entirely by the 1960s, and the site was decommissioned in 1991.^[13]

Between 2003^[14] and 2018,^[15] a dedicated team of volunteers reconstructed a 2 ft 6 in (762 mm) railway, reflecting this history. The Gunpowder Railway completed its first full public running season by the end of October in 2022,^[16] transporting over 1500 passengers. ^[17] With nearly 2,000 carried during the 2025 running taking the total carried to over 7,500 passengers by September 2025.^[18]

The 2 ft 6 in (762 mm) gauge narrow-gauge railway is 1,100 yards (1,000 m) long and has two stations: one on the Long Walk and the other by building 83, the current terminus of the railway.^[19] There are passing loops at both ends with plans in place to extend the running line in either direction over the coming years.

At the railway works, there is a restored demonstration train showcasing examples of all of the railway trucks previously used on site to carry the materials between the different processing buildings in the manufacture of gunpowder and other explosives.

Passenger rolling stock is converted RNAD trucks.^[20]