These are narrow-gauge railways at military establishments and former UK Government-owned explosives sites. These locations were often subject to the Official Secrets Act and other government restrictions, so many of them are less well documented.
The industrial use of narrow-gauge railways was quite extensive amongst the various military and civilian explosive factories, for example ICI Nobel's works at Ardeer and the Agency Explosive Factories run by ICI Nobel in the Second World War. In another example, the Ministry of Supply (MOS) Factory Dalbeattie used 2 ft 6 in (762 mm) gauge with a variety of bogie trucks mostly pushed by teams of three to six women. Stores, explosives, chemicals, rubbish and sewage, were all transported on this narrow-gauge system, which used at least 8 miles (13 km) of track.
Principally a target railway, though also carries personnel and equipment around the ranges. At least 39 locomotives and powered trollies have worked here.
The NRA originally had a temporary shooting range and railway on Wimbledon Common but in 1888 moved to Bisley. Initially using a Merryweather steam tram locomotive, later using diesel locomotives.
Ammunition transport railway, within the Royal Naval Armaments Depot, between store houses and piers. Eight battery-electric locomotives were used after 1929.
These factories were created during WW1 to unite the explosives, detonator, etc and the shell casings to make live munitions. This activity had the highest explosion risk, so precautions were very strict. They all followed a similar pattern in having standard gauge rail sidings separate from the filling area. These were used for delivery of the raw materials and for shipping out the products. The interior 'clean area' for filling comprised many small lightweight huts over a large area linked by raised walkways upon which lightweight 2 ft (610 mm) gauge rail was laid. Trolleys with bronze wheels were normally moved by hand between these buildings, though ponies or horses were sometimes used.
Production ceased at the factories at the end of the war, though some of them were used for dismantling ammunition into the early 1920s. Some clues as to the railways on these sites come from the auctions as the sites were cleared, examples are :
No 7 National Filling Factory in Hayes, Middlesex auction included 5,000 yards (4,600 m) of light Decauville track.[18]
No 10 National Filling Factory in Foleshill, Coventry auction listed 20 long tons (22.4 short tons; 20.3 t) Decauville track (16lbs), 50 light and heavy turntables on ball and roller bearings.[19]
Explosives stores (magazines) were in some cases remote from the clean area, and towards the end of the war there were a few orders for internal combustion locos to move materials. No 7 Filling Factory at Hayes had an entirely separate explosives magazine at Northolt, where a main line siding was linked to the 20 separate storage bunkers by light rail. 100 tons of explosives were moved each day by rail to the Hayes plant for processing. Records exist of two Baguley 2 foot gauge internal combustion locos ordered in 1917 by No 7 National Filling Factory for Northolt.[20] Seven similar locos were ordered in 1917 for No 2 National Filling Factory at Aintree,[20] so this must also have had light rail outside the main assembly area, such as for storage of shell cases (as this factory was designed to handle ship loads of munitions components received from overseas at Liverpool Docks).
Extensive WW I food supply depot line. At least four steam locomotives worked here, two or three of which went to the Sand Hutton Light Railway after the war.
Early 18 in (457 mm) gauge construction line used to assist in the demolition of army huts. Relaid as standard gauge starting in 1905-1907. 2 ft 6 in (762 mm) gauge line at the extensive railway training centre at Longmoor.
Specifically built to carry targetry to the ranges, originally 6 in number, F Range was converted to a SARTS Range and the rails were removed. Still continues to be used for its original purpose, Range trolleys are named after characters from “Thomas the Tank engine”. The system has a “siding” behind each front mantlet allowing trolleys to clear the main line. 1,165 yds long.
^ abcMitchell, Vic & Smith, Keith (2003). Surrey Narrow Gauge including South London. Middleton Press. ISBN1-901706-87-7.
^Corser, W.J.L. (April 2003). Wings on Rails: Industrial Railways in the Logistics Support of Britain's Air Defence Forces. Arcturus Press. ISBN0-907322-85-9.
^Nicholson, Peter (1975). Industrial Narrow Gauge Railways in Britain. Bradford, Barton. ISBN0-85153-236-5.
^Tele Rail (1994). The Longtown Military Railway. Carforth: Tele Rail.
^Semark, H.W. (1997). The Royal Naval Armament Depots of Priddy's Hard, Elson, Frater and Bedenham (Gosport, Hampshire): 1768 to 1977. Hampshire County Council. ISBN1-85975-132-6.
^ abcdefMitchell, Vic & Smith, Keith (2004). Hampshire Narrow Gauge including the Isle of Wight. Middleton Press. ISBN1-904474-36-5.
^ abYeatman, D. (December 1966). "Lodge Hill & Upnor Railway". The Industrial Railway Record. 12: 277–292.
^Mitchell, Vic & Smith, Kevin (2000). Kent Narrow Gauge. Middleton Press. ISBN1-901706-45-1.