These are narrow gaugerailways 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.
Locomotive Yorkshire on the Chattenden and Upnor Railway
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. To give an example, the Ministry of Supply (MOS) Factory Dalbeattie used 30 inch (750 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 (12 kilometers) 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 Royal Navy armaments depot, between store houses and piers. Eight battery-electric locomotives were used after 1929.
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.
^ abcMitchell, Vic and Smith, Keith (2003). Surrey Narrow Gauge including South London. Middleton Press. ISBN 1901706877.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Corser, W.J.L. (2003). Wings on Rails: Industrial Railways in the Logistics Support of Britain`s Air Defence Forces. Arcturus Press. ISBN 0-907322-85-9. {{cite book}}: Unknown parameter |month= ignored (help)
^Nicholson, Peter (1975). Industrial Narrow Gauge Railways in Britain. Bradford, Barton. ISBN 0-85153-236-5.
^ 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. ISBN 1-85975-132-6.
^ abcMitchell, Vic and Smith, Keith (2004). Hampshire Narrow Gauge including the Isle of Wight. Middleton Press. ISBN 1904474365.{{cite book}}: CS1 maint: multiple names: authors list (link)Cite error: The named reference "HNG" was defined multiple times with different content (see the help page).
^ abYeatman, D. (1966). "Lodge Hill & Upnor Railway". The Industrial Railway Record. 12: 277–292. {{cite journal}}: Unknown parameter |month= ignored (help)
^Clarke, B.R. and Veitch, C.C (1986). The Eighteen Inch Gauge Royal Arsenal Railway at Wooolwich. privately published by B.R. Clarke. ISBN 0-948951-00-1.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ abMitchell, Vic and Smith, Keith (2006). Dorset and Somerset Narrow Gauge. Middleton Press. ISBN 1904474764.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Rendell, Stan and Joan (1993). Steep Holm: The Story of a Small Island. Stroud: Alan Sutton Publishing. ISBN 0-7509-0323-6
^Farmer, Keith (1966). "Longmoor Military Railway". The Industrial Railway Record. 9. The Industrial Railway Society: pp.195-205. {{cite journal}}: |pages= has extra text (help); Unknown parameter |month= ignored (help)