| co_code | company_name |
| ANJR | Ashby and Nuneaton Joint Railway |
| ANSWR | Alexandra (Newport and South Wales) Railway |
| Ax Jnt | Axholme Joint Railway |
| BandM | Brecon and Merthyr Railway |
| Barry | Barry Railway |
| Birk | Birkenhead Railway |
| Bish | Bishops Castle Railway |
| BMLNWJR | Brecon and Merthyr Railway and London and North Western Joint Railway |
| BPGVR | Burry Port and Gwendraeth Valley Railway |
| BR | British Railways |
| BR | Highland Railway |
| BWAR | Bideford Westward Ho! and Appledore Railway |
| Cal | Caledonian Railway |
| CalGNSJR | Caledonian and Great North of Scotland Joint Railway |
| Cam | Cambrian Railway |
| Cam/Sh and W | Cambrian and Shrewsbury and Welshpool Joint Railway |
| CamGWJR | Cambrian and Great Western Joint Railway |
| Cardiff | Cardiff Railway |
| CEJR | Clifton Extension Joint Railway |
| CKPLNWJR | Cockermouth Keswick and Penrith and London and North Western Joint Railway |
| CKPR | Cockermouth Keswick and Penrith Railway |
| CLC | Cheshire Lines Committee (J) |
| CLCGCJR | Cheshire Lines Committee and Great Central Joint Railway |
| CMDPLR | Cleobury Mortimer and Ditton Priors Light Railway |
| COWSCJR | Croydon and Oxted and Woodside and South Croydon Joint Railway |
| CROXJR | Croydon and Oxted Joint Railway |
| CVHR | Colne Valley and Halstead Railway |
| CWJNR | Cleator and Workington Junction Railway |
| DAJR | Dundee and Arbroath Joint Railway |
| DBJR | Dumbarton and Balloch Joint Railway |
| DVLR | Derwent Valley Light Railway |
| DVR | Dearne Valley Railway |
| Eas | Easingwold Railway |
| Easton | Easton and Church Hope Railway |
| EKLR | East Kent Light Railway |
| Fur | Furness Railway |
| FurLNWJR | Furness and Lodon and North Western Joint Railway |
| FurMidJR | Furness and Midland Joint Railway |
| FYNR | Freshwater Yarmouth and Newport Railway |
| GBKJR | Glasgow, Barrhead and Kilmarnock Joint Railway |
| GCGW2JR | Great Central and Great Western Joint Railway |
| GCGWJR | Great Central and Great Western Joint Railway |
| GCGWMetJR | Great Central and Great Western and Metropolitan Joint Railway |
| GCLNWJR | Great Central and London and North Western Joint Railway |
| GCLNWMetJR | Great Central and London and North Western and Metropolitan Joint Railway |
| GCLYJR | Great Central and Lancashire and Yorkshire Joint Railway |
| GCMetJR | Great Central and Metropolitan Joint Railway |
| GCMidJR | Great Central and Midland Joint Railway |
| GCNSJR | Great Central and North Staffordshire Joint Railway |
| GCR | Great Central Railway |
| GER | Great Eastern Railway |
| GNGEJR | Great Northern and Great Eastern Joint Railway |
| GNLNWJR | Great Northern and London and North Western Joint Railway |
| GNLYJR | Great Northern and Lancashire and Yorkshire Joint Railway |
| GNLYLNWNERJR | Great Northern and Lancashire and Yorkshire and London and North Western and North Eastern Joint Railway |
| GNNSJR | Great Northern and North Staffordshire Joint Railway |
| GNR | Great Northern Railway |
| GNSHJR | Great North of Scotland and Highland Joint Railway |
| GNSR | Great North of Scotland Railway |
| GPJR | Glasgow and Paisley Joint Railway |
| GSWR | Glasgow and South Western Railway |
| GW2LMSJR | Great Western and London Midland and Scottish Joint Railway |
| GW2LNEJR | Great Western and London and North Eastern Joint Railway |
| GWLNWJR | Great Western and London and North Western Joint Railway |
| GWLSWJR | Great Western and London and South Western Joint Railway |
| GWMidJR | Great Western and Midland Joint Railway |
| GWR | Great Western Railway |
| GWR2 | Brecon and Merthyr Railway |
| GWR2 | Great Western Railway |
| GWR2 | Rhymney Railway |
| GWR2 | Taff Bargoed Joint Railway |
| GWRhyJR | Great Western and Rhymney Joint Railway |
| GWTVJR | Great Western and Taff Vale Joint Railway |
| Hal and Ov | Halifax and Ovenden Junction Railway (J) |
| Hal HL | Halifax High Level Joint Railway |
| Hales Jnt | Halesowen Joint Railway |
| HBR | Hull and Barnsley Railway |
| HNBJR | Highland and North British Joint Railway |
| HR | Highland Railway |
| IoWR | Isle of Wight Railway |
| IWCR | Isle of Wight Central Railway |
| KBJR | Kilsyth and Bonnybridge Joint Railway |
| KESLR | Kent and East Sussex Light Railway |
| Knott End | Knott End Railway |
| LBSCLSWJR | London Brighton and South Coast and London and South Western Joint Railway |
| LBSCLSWWLJR | London Brighton and South Coast and London and South Western and West London Joint Railway |
| LBSCR | London Brighton and South Coast Railway |
| LBSCSECJR | London Brighton and South Coast and South Eastern and Chatham Joint Railway |
| LMSLNEJR | London Midland and Scottish and London and North Eastern Joint Railway |
| LMSR | London Midland and Scottish Railway |
| LMSSJR | London Midland and Scottish and Southern Joint Railway |
| LNEMetJR | Great Central and Metropolitan Joint Railway |
| LNER | London and North Eastern Railway |
| LNER | North British Railway |
| LNWLYJR | London and North Western and Lancashire and Yorkshire Joint Railway |
| LNWMidJR | London and North Western and Midland Joint Railway |
| LNWNEJR | London and North Western and North Eastern Joint Railway |
| LNWNSJR | London and North Western and North Staffordshire Joint Railway |
| LNWR | London and North Western Railway |
| LNWRhyJnt | London and North Western and Rhymney Joint Railway |
| LSWR | London and South Western Railway |
| LTSR | London Tilbury and Southend Railway |
| LUJR | Lancashire Union Joint Railway |
| LYMidJR | Lancashire and Yorkshire and Midland Joint Railway |
| LYR | Lancashire and Yorkshire Railway |
| MCR | Maryport and Carlisle Railway |
| Mersey | Mersey Railway |
| MerseyWirral | Mersey and Wirral Joint Railway |
| Meth | Methley Joint Railway |
| Mid | Midland Railway |
| Mid Suff | Mid-Suffolk Light Railway |
| MidGNJR | Midland and Great Northern Joint Railway |
| MidNEJR | Midland and North Eastern Joint Railway |
| MidSMJJR | Midland and Stratford-upon-Avon and Midland Junction Joint Railway |
| MidTFGJR | Midland and Tottenham and Forest Gate Junction Joint Railway |
| MSJA | Manchester South Junction and Altrincham Joint Railway |
| MSWJnctR | Midland and South Western Junction Railway |
| NandBR | Neath and Brecon Railway |
| NBR | North British Railway |
| NER | North Eastern Railway |
| Nidd | Nidd Valley Light Railway |
| NLR | North London Railway |
| Nor and Suff Jnt | Norfolk and Suffolk Joint Railway |
| NSR | North Staffordshire Railway |
| NSWJR | North and South Western Junction Railway |
| Nth Sun | North Sunderland Light Railway |
| NUJR | North Union Joint Railway |
| OAGB Jnt | Oldham Ashton and Guide Bridge Junction Railway (J) |
| Otley and Ilkley | Otley and Ilkley Joint Railway |
| PDSWJR | Plymouth Devenport and South Western Junction Railway |
| PLA | Port of London Authority |
| PLR | Preston and Longridge Railway |
| PPWJR | Portpatrick and Wigtownshire Joint Railway |
| PTR | Port Talbot Railway |
| PWJR | Preston and Wyre Joint Railway |
| Rhy | Rhymney Railway |
| RSBR | Rhondda and Swansea Bay Railway |
| SCJR | Scottish Central Joint Railway |
| SDJR | Somerset and Dorset Joint Railway |
| SECR | South Eastern and Chatham Railway |
| Sh and Her Jnt | Shrewsbury and Hereford Joint Railway |
| Sh and Well Jnt | Shrewsbury and Wellington Joint Railway |
| Shr and Welsh Jnt | Shrewsbury and Welshpool Joint Railway |
| SKJR | Swinton and Knottingley Joint Railway |
| SMJR | Stratford-upon-Avon and Midland Junction Railway |
| SMLR | Shropshire and Montgomeryshire Light Railway |
| SR | London and South Western Railway |
| SR | Southern Railway |
| SSMWCR | South Shields Marsden and Whitburn Colliery Railway |
| SWJR | Severn and Wye Joint Railway |
| SYJR | South Yorkshire Joint Railway |
| T and H Jnt | Tottenham and Hampstead Junction Railway (J) |
| Taff Barg Jnt | Taff Bargoed Joint Railway |
| Ten Jnt | Tenbury Joint Railway |
| TFGJR | Tottenham and Forest Gate Junction Railway (J) |
| TVR | Taff Vale Railway |
| Vale of Towy | Vale of Towy Railway |
| W Lancs | West Lancashire Railway (J) |
| WCEJR | Whitehaven Cleator and Egremont Junction Railway |
| WCPLR | Weston Clevedon and Portishead Light Railway |
| Wirral | Wirral Railway |
| WLER | West London Extension Railway (J) |
| WLR | West London Railway (J) |
| WPJR | Weymouth and Portland Joint Railway |
| Wrex and Min Jnt | Wrexham and Minera Joint Railway |
| WRGJR | West Riding and Grimsby Joint Railway |
| WSCJR | Woodside and South Croydon Joint Railway |