| OriginCode | Origin |
| A&W | Albright & Wilson |
| AAOC | Anglo American Oil Co |
| ACC | Ashington Coal Company |
| ACR | Aberystwyth Cliff Railway 1896 - Current |
| ACT | Aberdeen Corporation Tramways 1899 - 1958 |
| ADRC | Alexandra Docks Railway Company |
| ADTC | Aberdeen District Tramways Co 1874 - 1896 |
| Africa | African Continent |
| ALR | Ashover Light Railway |
| AM | Air Ministry |
| AMERTN | Amerton Railway 1992 - Current |
| AMEY | Amey (Ferrovial) 2003 - Current |
| AMST | Amsterdam Trams, Holland |
| ANDR | Alexandra Newport Dock Railway |
| ANSD | Admiralty Naval Stores Department |
| AO | Associated Octel |
| APCM | Associated Portland Cement Manufacturers Ltd 1900 - 1978 |
| APW | A P Webb Plant Hire Ltd 1971 - Current |
| Arg | Argentina, South America |
| ASTC | Aberdeen Suburban Tramway Co 1904 - 1926 |
| Aus | Australia |
| Aust | Austria, Europe |
| AVC | Amber Valley Colliery |
| AVR | Avon Valley Railway |
| B&ER | Bristol & Exeter Railway |
| B&FETC | Blackpool & Fleetwood Electric Tramroad Company 1898 - 1920 |
| B&LR | Ballymena & Larne Railway |
| B&MR | Brecon & Merthyr Railway |
| B&MT | Birmingham & Midland Tramways 1872 - 1928 |
| B&RACL | Blaina & Raven Anthracite Collieries Ltd |
| B&W | Bodmin & Wadebridge Railway |
| BALAL | Bala Lake Railway 1972 - Current |
| BALFB | Balfour Beatty |
| BALR | Burton and Ashby Light Railway |
| BAM | Birmingham Airport Maglev 1984 - 1995 |
| Barry | Barry Railway |
| BCDR | Belfast County Down Railway |
| BCHCR | Bridgnorth Castle Hill Railway 1892 - Current |
| BCHPS | Bedfordshire, Cambridgeshire & Huntingdonshire Power Station Co 1926 - 1948 |
| BCLRS | B C L Rail Services Ltd |
| BCR | Babbacombe Cliff Railway 1926 - Current |
| BCT | Bolton Corporation Tramway 1900 - 1947 |
| BCTCL | Birmingham Central Tramways Co Ltd 1884 - 1896 |
| BECR | Bournemouth East Cliff Railway 1908 - Current |
| BELFC | Belfast Corporation Tramways |
| BELFS | Belfast Street Tramways |
| Belg | Belgium, Europe |
| BERLN | Berlin City Tramways, Germany |
| BESNEW | Bessbrook & Newry Tramway |
| BETC | Blackpool Electric Tramway Company 1885 - 1892 |
| BHC | Butlins Holiday Camps |
| BHR | Bristol Harbour Railway 1872 - 1987 |
| BICKWR | Bicton Woodland Railway 1963 - Current |
| BIHWM | Bradford Industrial & Horses at Work Museum |
| BIRCHR | Birchley Railway |
| BIRCT | Birmingham Corporation Tramways 1901 - 1953 |
| BIRKC | Birkenhead Corporation Tramways 1901 - 1937 |
| BIRKT | Birkenhead Tramways 1860 - 1901 |
| BIS | British Industrial Sand |
| BLAISE | Blaise Castle, Henbury, Bristol. |
| BLCT | Blackpool Corporation Tramways 1892 - 1986 |
| BLUER | Bluebell Railway |
| BMR | Brecon Mountain Railway |
| BNFL | British Nuclear Fuels plc |
| BOAM | Beamish Open Air Museum |
| BOC | Burmah Oil Co 1886 - 2000 |
| BODEN | Bodens Stone Ltd, Stanton-in-the-Peak, Derbyshire |
| BordM | Bord na Mona, Eire |
| BOUCT | Bournemouth Corporation Tramways 1902 - 1936 |
| BP | British Petroleum Company |
| BPGVR | Burry Port & Gwendraeth Valley Railway |
| BPLR | Barking Park Light Railway 1950c - Current |
| BPR | Bowaters Paper Railway. 1906 - 1969 |
| BPRW | Blenheim Palace Railway, Woodstock, Oxfordshire. |
| BPW | Beyer Peacock Works Tramway |
| BR | British Railways |
| BRDCO | Bradford Corporation |
| BRDCT | Bradford Corporation Tramways 1898 - 1950 |
| BRDSH | Bradshaw |
| BRTEC | British Railway Traffic & Electric Co Ltd (BRT) 1912 - 1974 |
| BRUST | Brussels Trams 1894 - Current |
| BSC | British Steel Corporation 1967 - 1999 |
| BSGR | British Sugar Corporation 1936 - 1991 |
| BTC | British Transport Commission 1947 - 1961 |
| BTDB | British Transport Docks Board 1962 - 1981 |
| BTNCT | Brighton Corporation Tramways 1901 - 1939 |
| BTRC | Bristol Tramways Company 1875 - 1941 |
| BTSL | Blackpool Transport Services Limited 1986 - Current |
| BUDT | Budapest Electric Trams, Hungary 1887 - Current |
| BVR | Bure Valley Railway |
| BWC | British Wagon Company |
| BWCR | Bournemouth West Cliff Railway 1908 - Current |
| BWHT | Birkenhead Wirral Heritage Tramway 1960 - Current |
| C&DLR | Cheltenham & District Light Railway 1901 - 1930 |
| C&DT | Chesterfield & District Tramways 1882 - 1904 |
| C&LR | Cavan & Leitrim Railway |
| C&New | Cowes & Newport Railway |
| C&SL | City & South London Railway |
| C&WR | Canterbury & Whitstable Railway |
| CALER | Cavan, Leitrim & Roscommon Light Railway |
| Cam | Cambrian Railway |
| Canada | Canada, North America |
| CARCT | Cardiff Corporation Tramways 1902 - 1950 |
| CAVIB | Castlederg & Victoria Bridge Tramway |
| CCA | Companhia Carril Americano, Portugal 1872 - 1893 |
| CCFP | Companhia Carris de Ferro do Porto, Portugal 1893 - 1946 |
| CCLR | Cleethorpes Coast Light Railway |
| CCT | Chesterfield Corporation Tramways 1904 - 1927 |
| CDRJC | County Donegal Railways Joint Committee |
| CEA | Central Electricity Authority 1954 - 1957 |
| CEGB | Central Electricity Generating Board |
| CETC | Coventry Electric Tramways Company 1895 - 1912 |
| CF | Cardiff Railway |
| CFAT | Centre For Alternative Technology |
| Chile | Chile, South America |
| China | China, Asia |
| CIE | Coras Iompair Eireann |
| CIETT | Cranfield Institute, Earith Test Track, Cambridgeshire |
| CIWL | Compagnie Internationale de Wagons-Lits |
| CLC | Cheshire Lines Committee |
| CLOGH | Clogher Valley Railway |
| CLR | Central London Railway 1900 - 1933 |
| CLTC | Carris Lisbon Tramways Company, Portugal 1872 - Current |
| CMR | Cairngorn Mountain Railway 2001 - Current |
| CNTRKD | Contracked Lands |
| COCETC | City of Carlisle Electric Tramways Co. Ltd. 1900 - 1931 |
| COGTC | City of Gloucester Tramways Co 1879 - 1904 |
| COHT | City of Hull Tramways 1896 - 1919 |
| CONKDC | Conkers Discovery Centre 2001 - Current |
| COR | Corris Railway |
| COVCT | Coventry Corporation Tramways 1912 - 1940 |
| COXTM | City of Oxford Tramways 1881-1914 |
| COYTC | City of York Tramways Company 1886 - 1945 |
| CPR | Canadian Pacific Railroad |
| CR | Caledonian Railway |
| CRNRY | Cornwall Railway |
| CRR | Clifton Rocks Railway 1893 - 1934 |
| CSTC | Cambridge Street Tramways Company 1880 - 1934 |
| CSTR | Cricket St Thomas Railway 1975 - Current |
| CTC | Cardiff Tramways Company 1872 - 1902 |
| CTS | Contract Track Services |
| CVRM | Conwy Valley Railway Museum 1971c - Current |
| CWAR | Clonmacnois & West Offaly Railway |
| CWP | Cotswold Wildlife Park |
| Czech | Czechoslavakia, Europe |
| D&DTC | Dundee & District Tramway Co 1877 - 1902 |
| D&IWB | Docks & Inland Waterways Board (BTC) 1953 - 1962 |
| Darj | Darjeeling Himalayan Railway, India |
| DB | Deutsche Bundesbahn |
| DBHT | Douglas Bay Horse Tramway 1876 - Current |
| DBS | DB Schenker |
| DBST | Dublin & Blessington Steam Tramway |
| DCT | Derby Corporation Tramways 1904 - 1934 |
| DCWB | Durham County Water Board |
| Den | Denmark, Europe |
| DESR | Dublin & South Eastern Railway |
| DEUTR | Deutsche Reichsbahn, Germany 1937 - 1949 |
| DINQ | Dinorwic Quarry |
| DLRL | Docklands Light Railway Ltd, East London 1987 - Current |
| DN&GR | Dundalk Newry & Greenore Railway |
| DORL | Dorman Long 1875 - 1967 |
| DorSQ | Dorothea Slate Quarry |
| DRC | Didcot Railway Centre |
| DS&DE | Dudley, Stourbridge & District Electric Traction Co. Ltd 1899 - 1930 |
| DSB | Danske Statsbaner (Danish State Railways) |
| DSET | Douglas Southern Electric Tramway 1896 - 1939 |
| DUKIN | Dublin & Kingstown Railway |
| DunG | Dundee Gasworks |
| DUSS | Dusseldorf Trams, Germany |
| Dutch | Holland, Europe |
| DUUTC | Dublin United Tramways Company |
| ECC | English China Clays 1919 - 1999 |
| ECJS | East Coast Joint Stock |
| ECR | Eastern Counties Railway |
| ECT | Edinburgh Corporation Tramways 1919 - 1956 |
| EDMEC | Edmundsons Electricity Corporation 1929 - 1948 |
| EDT | Edinburgh & District Tramways |
| EHR | Eaton Hall Railway |
| EMT | East Midlands Trains (Franchise) 2007 - Present |
| ENR | Egyptian National Railway, North Africa |
| ESSO | Esso Petroleum Co Ltd 1912 - Current |
| ESTCL | Edinburgh Street Tram Company Ltd |
| Eston | Estonia, Europe |
| ESTONL | Eston-Lackenby |
| ETL | Edinburgh Trams Ltd |
| EURO | Eurostar Ltd |
| EVLR | Evesham Vale Light Railway |
| EXCT | Exeter Corporation Tramways 1905 - 1931 |
| FAIRB | Fairbourne Railway |
| FDTC | Falkirk & District Tramways Co 1905 - 1936 |
| FGW | First Great Western (Franchise) 1998 - Present |
| Fiji | Fiji, Oceania |
| Fin | Finland, Europe |
| FIRSTE | First Engineering |
| FMR | Ferry Meadows Railway |
| FR | Furness Railway |
| FR&DC | Felixstowe Railway & Dock Company 1879 - 1976 |
| France | France, Europe |
| FRCo | Ffestiniog Railway Company (Original) 1836 - 1946 |
| FRCoP | Ffestiniog Railway Company (Preserved) 1954 - Current |
| FRNKT | Frankfurt Trams, Germany |
| FRZBRK | Furzebrook Tramway c1840 - 1957 |
| FS | First ScotRail (Franchise) 2004 - Present |
| FSR | Finnish State Railways VR |
| FWCR | Bournemouth Fishermans Walk Cliff Railway 1935 - Current |
| G&DTC | Gateshead & District Tramways Co 1901 1951 |
| GAMBL | Gamble |
| GAPR | Golden Acre Park Railway, Leeds 1931 - 19xx |
| GCBR | Giants Causeway & Bushmills Railway |
| GCC | Grosvenor Caving Club |
| GCR | Great Central Railway |
| GCT | Glasgow Corporation Tramways 1894 - 1962 |
| GDSC | Glasgow District Subway Company, 1896 - 1977 |
| GEC | General Electric Company 1886 - 1999 |
| GER | Great Eastern Railway |
| Germ | Germany, Europe |
| GGPTE | Greater Glasgow Passenger Transport Executive 1977 - 1985c |
| GGRL | Groudle Glen Railway Ltd |
| Ghana | Ghana, Africa |
| GICAT | Giants Causeway Tramway Co. |
| GJR | Grand Junction Railway |
| GLCC | Gas Light & Coke Company 1812 - 1949 |
| GLMR | Great Laxey Mine Railway |
| GLR | Gartell Light Railway |
| GN&NE | Great Northern & North Eastern Joint Line |
| GNER | Great North Eastern Railway (Franchise) 1996 - 2007 |
| GNPB | Great Northern, Piccadilly and Brompton Railway |
| GNR | Great Northern Railway |
| GNRI | Great Northern Railway (Ireland) |
| GNSR | Great North of Scotland Railway, 1846 - 1923. |
| GOT | Great Orme Tramway, Llandudno 1902 - Current |
| GRAZ | Graz Trams, Austria |
| GSRI | Great Southern Railway (Ireland) |
| GSWR | Glasgow and South Western Railway |
| GSWR2 | Great Southern & Western Railway |
| GTHRNT | Goathorn Tramway |
| GTRL | Govia Thameslink Rly Ltd (Great Northern (Franchise) 2014 - Pesent |
| GTRL1 | Govia Thameslink Rly Ltd Southern (Franchise) |
| GULF | Gulf Oil (GB) Ltd. |
| Gull | Gullivers Land, Milton Keynes, Buckinghamshire. |
| GVTRM | Glyn Valley Tramway 1873 - 1935 |
| GWR | Great Western Railway |
| GWVR | North Pembrokeshire & Fishguard Railway |
| H&DET | Hastings & District Electric Tramways 1905 - 1929 |
| HALCT | Halifax Corporation Tramways 1898 - 1939 |
| HALLE | Halle Trams, Germany |
| HARDW | Hardwick, West Ewell |
| HBR | Hull & Barnsley Railway 1905 - 1922 |
| HBWRJ | Hull Barnsley & West Riding Junction Railway & Dock Company 1885 - 1905 |
| HECR | Hastings East Hill Cliff Railway 1903 - Current |
| HEWDN | Hewden Plant Hire |
| HHM | Hodbarrow Haematite Mine |
| HIBL | Hibberts Ltd |
| HINGS | Hingley Sawmills, Duffield, nr Derby 1874 - Current |
| HITR | Hitachi Rail |
| HK | Hong Kong, Asia |
| HLR | Heatherslaw Light Railway 1988 - Current |
| HMNBP | HMNB Plymouth Devonport Dockyard |
| HOH | Hill of Howth Tramway |
| HR | Highland Railway |
| Hung | Hungary, Europe |
| HWCR | Hastings West Hill Ciff Railway 1891 - Current |
| HWIC | Holwell Iron Co Ltd 1876 - 1917 |
| HYDRX | Hydrex Equipment (UK) Ltd 1985 - 2011 |
| I&SC | Iron & Steel Corporation of Great Britain 1951 - 1954 |
| ICI | Imperial Chemical Industries 1926 - 2008 |
| ICT | Ipswich Corporation Tramways 1903 1926 |
| IGMT | Ironbridge Gorge Museum Trust |
| IGMTL | Ironbridge Gorge Museum Trust Ltd |
| Ind | Industrial Operator |
| India | India, Asia |
| Indo | Indonesia, Asia |
| IOM | Isle of Man |
| IOMR | Isle Of Man Railway |
| IOMT | Isle of Man Tramways & Electric Power Co. Ltd 1894 - 1902 |
| IOWR | Isle Of Wight Railway |
| IOWSR | Isle Of Wight Steam Railway |
| Ire | Ireland, Europe |
| ISC | Imperial Smelting Corporation, Avonmouth |
| ISUG | Irish Sugar Company |
| Italy | Italy, Europe |
| JAIRD | J Aird & Co, London (Contractors) |
| Japan | Japan, Asia |
| JARVF | Jarvis - Fastline 1994 - 2010 |
| JER | Jersey Eastern Railway |
| JOHBRG | Johannesburg, South Africa |
| JR | Jersey Railway |
| KayCo | Kaye & Co. Lime and Cement Works, Long Itchington, Southam, Warwickshire. |
| KBST | Kew Bridge Steam Museum |
| KCC | Kelty Community Council |
| KCRC | Kowloon-Canton Railway Corporation, Hong Kong. |
| KIR | Kettering Ironstone Railway. 1875 - 1962 |
| KPCC | Ketton Portland Cement Company Ltd 1928 - 1981 |
| KREF | Krefeld Trams, Germany |
| L&BR | Lynton & Barnstaple Railway |
| L&BRT | Lynton & Barnstaple Railway Trust, Woody Bay. 2000 - Present |
| L&MR | Liverpool & Manchester Railway |
| L&WC | L&W Contractors Ltd |
| L&WT | Leamington & Warwick Tramway 1881 - 1930 |
| LANLR | Llanberis Lake Railway 1971 - Current |
| LANTC | Lanarkshire Tramways Co 1903 - 1931 |
| Laport | Laporte Industries |
| Lat | Latvia, Europe |
| LBC | London Brickworks Company |
| LBNGR | Leighton Buzzard Railway (Preserved) 1968 - Current |
| LBR | London & Birmingham Railway |
| LBSCR | London, Brighton & South Coast Railwway |
| LCCT | London County Council Tramways 1899 - 1933 |
| LCDR | London, Chatham & Dover Railway |
| LCES | Liverpool Corporation Electricity Supply |
| LCPT | Liverpool Corporation Tramways 1898 - 1986 |
| LCT | Leeds City Tramways 1898 - 1959 |
| LDECR | Lancashire, Derbyshire & East Coast Railway |
| LEICT | Leicester Corporation Tramways 1904 - 1949 |
| LEVB | Lever Brothers |
| LLCR | Lynton & Lynmouth Cliff Railway 1890 - Current |
| LLR | Longleat Light Railway |
| LLSR | Londonderry & Lough Swilly Railway |
| LMF | London Millennium Funicular 2003 - Current |
| LMS | London Midland & Scottish Railway |
| LMSNCC | LMS (Northern Counties Committee) |
| LMT | Lee Moor Tramway |
| LNER | London & North Eastern Railway |
| LNWR | London & North Western Railway |
| LONR | Londonderry Railway |
| LONST | London Street Tramways 1860-1899 |
| LOR | Liverpool Overhead Railway |
| LOWCT | Lowestoft Corporation Tramways 1903 - 1931 |
| LPL | Lubricants Producers Ltd |
| LPTB | London Passenger Transport Board 1933 - 1948 |
| LR | Llangollen Railway |
| LRT | London Regional Transport 1984 - 2000 |
| LSACT | Lytham St. Annes Corporation Tramways 1903 - 1937 |
| LSCR | Llechwedd Slate Caverns Railway 1979 - Current |
| LSM | London Science Museum |
| LSR | Lakeside Steam Railway |
| LSTR | Launceston Steam Railway 1983 - Current |
| LSWR | London & South Western Railway 1838 - 1922 |
| LT | London Transport |
| LTB | London Transport Board 1963 - 1970 |
| LTC | Leeds Tramways Company 1891 - 1898 |
| LTCO | Liverpool Tramways Company 1869 - 1898 |
| LTE | London Transport Executive (GLC) 1970 - 1984 |
| LTEX | London Transport Executive 1948 - 1963 |
| LTLAC | Limmer & Trinidad Lake Asphalt Co 1881 - 1971 |
| LTRCO | London Tramways Co |
| LTSR | London, Tilbury & Southend Railway |
| LUT | London United Tramways 1894 - 1933 |
| LUTCT | Luton Corporation Tramways 1908 - 1932 |
| LVSR | Lappa Valley Steam Railway 1974 - Current |
| LYR | Lancashire & Yorkshire Railway |
| LZRNL | Lizard RNLI Cliff Railway 1995 - Current |
| M&GC | Metropolitan & Great Central Joint Committee |
| M&GN | Midland & Great Northern Joint Railway |
| ManxN | Manx Northern |
| MB | Manchester Birmingham Railway |
| MCKCHN | McKechnie Brothers Ltd 1915 - 1971 |
| MCR | Maryport & Carlisle Railway |
| MCT | Manchester Corporation Tramways 1901 - 1949 |
| MCTC | Manchester Carriage & Tramways Company 1880 - 1903 |
| MDR | Metropolitan District Railway 1864 - 1933 |
| MER | Merseyrail (Franchise) |
| MERCL | Manx Electric Railway Co. Ltd 1902 - 1957 |
| MET | Metropolitan Electric Tramways 1904 - 1939 |
| MetD | Metropolitan District Railway |
| METL | Modern Electric Tramways Ltd 1954 - 1969 |
| MetR | Metropolitan Railway |
| MFP | Ministry of Fuel & Power |
| MGWR | Midland Great Western Railway |
| MIDTDL | Midland Tar Distillers Ltd 1923 - 1967 |
| MLPRM | MLP Railway Maintenance 1994 - Current |
| MLR | Markeaton Light Railway |
| MMB | Milk Marketing Board |
| MOD | Ministry of Defence 1964 - Current |
| MODA | Ministry Of Defence (Army Pool) |
| MoM | Ministry of Munitions |
| MON | Monmouthshire Railway & Canal Company |
| MOS | Ministry of Supply 1939 - 1959 |
| Mozam | Mozambique, Africa |
| MPLR | Markeaton Park Light Railway, Derby 1931 - Current |
| MR | Midland Railway |
| MSC | Manchester Ship Canal Company |
| MSJAR | Manchester, South Junction & Altrincham Railway |
| MSLR | Manchester, Sheffield & Lincolnshire Railway |
| MSM | Manchester Science Museum |
| MSWJR | Midland & South Western Junction Railway |
| MTBD | Marsh Trackwork, Barton Dock |
| MTC | Metropolitan Tramways Co 1870 - 1904c |
| MTS | Montpellier Tram System, France |
| MURGC | Murgatroyds Chemicals |
| Namib | Namibia, Africa |
| NB | National Benzole Co. Ltd. 1919 -1957 |
| NBAYR | North Bay Railway 1931 - Current |
| NBR | North British Railway |
| NCB | National Coal Board 1947 - 1987 |
| NCT | Neath Corporation Tramways 1896 - 1920 |
| NELR | Nocton Estate Light Railway, Lincolnshire |
| NER | North Eastern Railway |
| NET | Nottingham Express Transit |
| NETR | Network Rail |
| NewB | New Build |
| NEWCT | Newcastle Corporation Tramways 1901 - 1950 |
| NewZ | New Zealand |
| NIR | Northern Ireland Railways |
| NLR | North London Railway |
| NORCT | Northampton Corporation Tramways 1904 - 1934 |
| NORD | Compagnie des Chemin de Fer du Nord 1845 - 1937 |
| NOREX | Nor Ex Hire Rail Ltd |
| NOTCT | Nottingham Corporation Tramways 1901 - 1936 |
| NP | National Power 1990 - 2001 |
| NRM | National Railway Museum |
| NRMSGR | NRM South Garden Miniature Railway |
| NSB | NSB Norwegian State Railways |
| NSBA | National Sugar Beet Association 1909 - 1936 |
| NSR | North Staffordshire Railway |
| NTGB | North Thames Gas Board 1949 - 1973 |
| NWNGR | North Wales Narrow Gauge Railways 1877 - 1916 |
| NYC | New York Subway |
| OCT | Oldham Corporation Transport 1900 - 1946 |
| OW&W | Oxford, Worcester & Wolverhampton Railway |
| P&DTC | Paisley & District Tramways Co 1904 - 1923 |
| P&HLR | Portsdown & Hordean Light Railway 1903 - 1935 |
| P&JR | Pontop & Jarrow Railway |
| P&M | Powlesland and Mason |
| Padarn | Padarn Railway |
| PADRN | Padstow RNLI Cliff Railway 2001 - Current |
| Pak | Pakistan, Asia |
| PBA | Port of Bristol Authority, Avonmouth Docks. |
| PCR | Powderham Castle Railway, Devon |
| PenQT | Pen-yr-Orsedd Quarry tramways. 1862 - 1979 |
| PenR | Penrhyn Quarry Railway. 1878 - 1962. |
| Peru | Peru, South America |
| PHILP | Philips Petroleum 1917 - 2002 |
| PLM | Chemins de fer de Paris à Lyon et à la Méditerranée |
| PLT | Pwllheli & Llanbedrog Tramway 1890 - 1929 |
| PO | Private Owner Operator |
| POD | Powell Duffryn |
| Poland | Poland, Europe |
| Port | Portugal, Europe |
| PORTT | Portreath Tramway |
| POS | Port Of Sunderland |
| Post | Post Office Railway, London |
| POT | Port of Tyne |
| PR | Admiralty Harbour of Refuge Railway |
| PRAGU | Prague Trams, Czech Rebublic 1875 - Current |
| PRCEC | Price & Reeves Civil Engineering Contractors |
| PRO | Procor (UK) Ltd. |
| PTC | Portstewart Tramways Co 1882 - 1926 |
| PTR | Port Talbot Railway & Docks Company |
| R&CBC | Redcar & Cleveland Borough Council |
| R&ER | Ravenglass & Eskdale Railway |
| RAF | Royal Air Force |
| RCT | Rawtenstall Corporation Tramways 1909 - 1933 |
| READY | Readypower Engineering |
| Rep | Replica |
| RGNT | Regent Oil Co. Ltd. |
| RHDR | Romney Hythe & Dymchurch Railway |
| Rhod | Rhodesia, Africa |
| RHYLM | Rhyl Miniature Railway 1911 - Current |
| Rhym | Rhymney Railway |
| RIV | Continental |
| RLR | Ruislip Lido Railway |
| RLS | Rail Leasing Services |
| RMSL | RMS Locotec |
| RN | Royal Navy |
| RNAD | Royal Naval Armaments Depot |
| ROBMET | Robert Metzger, Austria |
| ROBMS | Robert McAlpine & Sons Ltd 1869 - Current |
| ROBSL | Robert Brett & Sons Ltd 1909 - Current |
| ROF | Royal Ordnance Factory |
| Roma | Romania, Europe |
| RPA | Railway Procurement Agency |
| RPSI | Railway Preservation Society of Ireland |
| RPT | Ryde Pier Tramway 1864 - 1969 |
| RSBR | Rhondda & Swansea Bay Railway |
| RTAC | Richard Thomas & Co. |
| RVLR | Rhiw Valley Light Railway |
| RWC | River Wear Commissioners |
| S&DJR | Somerset & Dorset Joint Railway |
| S&DR | Stockton & Darlington Railway |
| S&L | Stewarts & Lloyds Ltd 1903 - 1967 |
| S&MR | Shropshire & Montgomeryshire Railway |
| S&MT | Stratford & Moreton Tramway |
| S&P | Stothert & Pitt 1844 - 1986 |
| S&PR | Sandy & Potton Railway |
| SAfr | South Africa |
| SAND | Sands Ltd, Colwick, Nottingham |
| SANF | San Francisco Trams, USA |
| SBMR | Severn Beach Miniature Railway |
| SBR | Statfold Barn Railway |
| SC&IC | Staveley Coal and Iron Co. 1863 - 1960. |
| SCI | Sheepbridge Coal and Iron Co. |
| SCR | Southend Cliff Railway 1912 - Current |
| SCR1 | Scarborough Central Cliff Railway 1881 - Current |
| SCR2 | Scarborough South Spa Cliff Railway 1875 - Current |
| SCR3 | Scarborough St Nicholas Cliff Railway 1925 - Current |
| SCT | Sheffield Corporation Tramways 1896 - 1960 |
| SCTR | Southampton Corporation Tramways 1896 - 1949 |
| SDLR | South Downs Light Railway |
| SDNC | Swindon College |
| SDR | South Devon Railway |
| SECR | South East & Chatham Railway |
| SER | South Eastern Railway |
| SERS | South Eastern Railways (South Eastern Franchise) |
| SGD | Scottish Grain Distillers |
| SGT | Shipley Glen Tramway 1895 - Current |
| SH | Swansea Harbour Trust |
| SHLR | Sand Hutton Light Railway, Yorkshire |
| SIC | Stanton Ironworks Company 1870c - 1900 |
| SICL | Stanton Ironworks Company Ltd 1900 - 1960 |
| Sierra | Sierra Leone, Africa |
| Sing | Singapore, Asia |
| SITC | Swansea Improvement & Tramways Co 1900 - 1937 |
| SLNCR | Sligo, Leitrim & Northern Counties Railway |
| SLTC | South Lancashire Tramways Co 1902 - 1933 |
| SLTCR | Saltburn Cliff Railway 1884 - Current |
| Slvak | Slovakia, Europe |
| SMBP | Shell-Mex & BP Ltd 1932 - 1976 |
| SML | Shell-Mex Ltd 1921 - 1931 |
| SMR | Snowdon Mountain Railway 1896 - Current |
| SNCB | SNCB Societe Nationale des Chemins de fer Belges |
| SNCF | SNCF Societe Nationale des Chemins de fer Français 1937 - Current |
| SNMR | Snaefell Mountain Railway, Isle Of Man 1895 - Current |
| SOUTHR | Southwold Railway |
| Spain | Spain, Europe |
| SPR | Southend Pier Railway 1889 - Current |
| SPT | Southport Pier Tramway 1863 - Current |
| SPTE | Strathclyde Passenger Transport Executive 1985c - 2006 |
| SR | Southern Railway |
| SSSP | South Shields South Pier |
| ST | Siemens Transport |
| STC | Sheffield Tramways Company 1872 -1896 |
| STDVD | St Davids RNLI Cliff Railway 1994 - Current |
| STKPCT | Stockport Corporation Tramways 1901 - 1951 |
| STMWY | Seaton Tramway 1970 - Current |
| STSL | Storage & Transport Systems Ltd |
| STTC | Shell Transport & Trading Co. |
| Sudan | Sudan, Africa |
| SUKO | Shell UK Oil |
| SUNDCT | Sunderland Corporation Tramways 1900 - 1954 |
| SVR | Severn Valley Railway |
| SW&MR | Swansea & Mumbles Railway 1804 - 1960 |
| Sweden | Sweden, Europe |
| SWNCT | Swindon Corporation Tramways 1904 - 1929 |
| SWP | Shepreth Wildlife Park |
| SWT | South West Trains |
| SWTZ | Switzerland, Europe |
| SYPTE | South Yorkshire Passenger Transport Executive, Sheffield 1974 - 2006 |
| TA | The Admiralty 1831 - 1964 |
| Taiwan | Taiwan, Asia |
| Tasm | Tasmania, Oceana |
| TATS | Third Avenue Transit System, New York |
| TAYLW | Taylor Woodrow 1921 - 2007 |
| TDC | Telford Development Corporation, Telford Town Park |
| TFE | Transport for Edinburgh |
| TFGM | Stagecoach Metrolink 2007 - Current |
| TFL | Transport for London 2000 - Current |
| Thai | Thailand, Asia |
| ThakeT | Thakeham Tiles, Storrington, West Sussex |
| THBR | Throckley Brickworks |
| THOML | Thomas Land, Drayton Manor 2008 - Current |
| THT | The Hague Trams, Holland |
| TIPH | Tiphook Rail Leasing, London 1975 - 1998 |
| TNK | Tank Rentals Ltd. |
| TNTP | Trethomas-Ness Tar Plant, Caerphilly 1929 - 1946 |
| Tonga | Tonga, Oceana |
| TPCCL | Tunnel Portland Cement Company Ltd 1874 - 1981 |
| TPR | Thorpe Park Railway |
| TRALE | Tralee & Dingle Light Railway |
| TRL | Tiger Rail Leasing |
| TRO | Talyllyn Railway (Original)1865 - 1950 |
| TRP | Talyllyn Railway (Preserved) 1951 - Current |
| TSE | Tata Steel Europe |
| TVR | Taff Vale Railway |
| TWPTE | Tyne & Wear Passenger Transport Executive |
| TWW | Thomas W Ward, Sheffield |
| U/K | Unknown |
| UDCT | Upper Douglas Cable Tramway 1896 - 1929 |
| UERL | Underground Electric Railways Company of London Limited 1902 - 1933 |
| UKCML | UK Coal Mining Ltd |
| ULST | Ulster Railway |
| URBSM | Urbis Museum 2002 - 2011 |
| USA | United States of America |
| USATC | The United States Army Transportation Corps |
| USC | United Steel Companies 1918 - 1967 |
| UTA | Ulster Transport Authority |
| VER | Volks Electric Railway, Brighton 1883 - Current |
| VIP | VIP Petroleum Ltd. |
| VIRGWC | Virgin West Coast |
| VoR | Vale Of Rheidol Light Railway |
| W&SVR | Waterford & Suir Valley Railway |
| WA | Woolwich Arsenal |
| WACT | Wallasey Corporation Tramways 1902 - 1933 |
| WAM | Windmill Animal Farm |
| WATLW | Waterford Limerick Western |
| WATN | Waterman Railways |
| WCJS | West Coast Joint Stock |
| WCLAR | West Clare Railway |
| WCT | Warrington Corporation Tramways 1902 - 1935 |
| WD | War Department |
| WDET | Wolverhampton District Electric Tramways Co. Ltd 1900 - 1925 |
| WDETC | Wrexham & District Electric Tramways Ltd 1903 - 1927 |
| WDONR | West Donegal Railway |
| WHCT | West Ham Corporation Tramways 1904 - 1940 |
| WHD | W H Davis & Sons Ltd |
| WHRC | Welsh Highland Railway, Caernavon |
| WHRL | Welsh Highland Railway Ltd |
| WI | West Indies |
| WIMR | Woolmer Instructional Military Railway |
| WJR | West Japan Railways |
| WLR | Wotton Light Railway |
| WMC&S | W M Cory and Son |
| WMCRY | W M Cory & Son 1928 - 1972 |
| WMPTE | West Midlands Passenger Transport Executive, Centro, Birmingham 1969 - Current |
| WMSP | West Midland Safari Park Railway 1979 - Current |
| WOLCT | Wolverhampton Corporation Tramways 1902 - 1928 |
| WOODH | Woodhorn Railway |
| WPLR | Wicksteed Park Lakeside Railway 1931 - Current |
| WPR | Wilsons Pleasure Railway, Allhallows-on-Sea, Kent. |
| WSP | Windsor Safari Park 1969 - 1992 |
| WTCL | Wolverhampton Tramways Co. Ltd 1878 - 1900 |
| YTDL | Yorkshire Tar Distillers Ltd |
| YUGO | Yugoslavia, Europe |