This section lists the abbreviations used for various railways in the index of LB&SCR locomotives.
| A(NSW)DR | Alexandra (Newport and South Wales) Docks & Railway Co.
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| ACC | Ashington Coal Co.
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| ADR | Alexandra Docks Railway
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| BC | Broomhill Colliery
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| BR | British Railways
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| CCC | Cowpen Coal Co.
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| CRC | Cannock & Rugeley Colliery Co.
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| EHLR | Edge Hill Light Railway
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| Frazer | Messers Frazer & Co.
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| FYN | Freshwater, Yarmouth & Newport Railway
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| GWR | Great Western Railway
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| IWCR | Isle of Wight Central Railway
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| JC | Croydon & Dover Joint Committee (1842-05/1844-03), later the Brighton, Croydon & Dover Joint Committee (1844-03/1845-04-12)
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| KESR | Kent & East Sussex Railway
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| L&B | London & Brighton Railway (1839-01-08/1844-03 pre Joint Committee)
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| L&BR | London & Brighton Railway (1845-04-12/1846-10 post Joint Committee)
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| L&C | London & Croydon Railway (1838-07-28/1842-05 pre Joint Committee)
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| L&CR | London & Croydon Railway (1845-04-12/1846-10 post Joint Committee)
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| LMS | London, Midland & Scottish Railway
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| LSWR | London, South Western Railway
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| M&BR | Manchester & Birmingham Railway
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| MS&LR | Manchester, Sheffield and Lincolnshire Railway
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| Pauling | Pauling & Co.
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| R. Madigan | R. Madigan (contractor)
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| RIC | Rhymney Iron Co.
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| SE | South Eastern Railway (1841-12/1842-05)
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| SECR | South Eastern & Chatham Railway (1899/1923)
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| SER | South Eastern Railway (1845-04-12/1898)
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| SMJR | Stratford-on-Avon & Midland Junction Railway
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| SR | Southern Railway (1923/1947)
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| WC&PR | Weston, Clevedon & Portishead Railway
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| WE&CPR | West End & Crystal Palace Railway
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| WLR | West Lancashire Railway
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