Steam locomotives operated in the United Kingdom with names beginning with S.
| Name | Railroad, # | Builder, s/n | Build date | Whyte type | Notes |
|---|---|---|---|---|---|
| S. R. Graves | LNWR 132 | 3/1913 | 4-4-0 | Became LMS 5384; wd 2/1936. | |
| Saddleback | LNWR 845 | 3/1913 | 4-4-0 | Became LMS 5391; wd 2/1936. | |
| Sagittarius | GWR | 2-4-0 | |||
| Saighton Grange | GWR 6855 | 4-6-0 | |||
| Saint Ambrose | GWR 2912 | 4-6-0 | |||
| Saint Andrew | GWR 2913 | 4-6-0 | |||
| Saint Augustine | GWR 2914 | 4-6-0 | |||
| Saint Bartholomew | GWR 2915 | 4-6-0 | |||
| Saint Benedict | GWR 2916 | 4-6-0 | |||
| Saint Benet's Hall | GWR 5947 | 4-6-0 | |||
| Saint Brides Hall | GWR 4972 | 4-6-0 | |||
| Saint David | GWR 2920 | 4-6-0 | |||
| Saint Dunstan | GWR 2921 | 4-6-0 | |||
| Saint Edmund Hall | GWR 5960 | 4-6-0 | |||
| Saint Gabriel | GWR 2922 | 4-6-0 | |||
| Saint Helena | GWR 2924 | 4-6-0 | |||
| Saint Martin | GWR 4900 | 4-6-0 | |||
| Saint Nicholas | GWR 2926 | 4-6-0 | |||
| Saint Patrick | GWR 2927 | 4-6-0 | |||
| Saint Sebastian | GWR 2928 | 4-6-0 | |||
| Saint Stephen | GWR 2929 | 4-6-0 | |||
| Saint Vincent | GWR 2930 | 4-6-0 | |||
| Salamanca | Murray | 1812 | 2-2-2 | More information: Wikipedia. | |
| Salmon Trout | LNER 2506 | 4-6-2 | |||
| Salopian | LNWR 2193 | Crewe | 2/1896 | 2-4-0 | Became LMS 5059; wd 10/1925. |
| Salus | GWR | 0-6-0 | |||
| Sampson | GWR 2142 | Vulcan | 1855 | 0-6-0 | Ex-SDR in 1876; wd 1884. |
| Sampson | SDR | Vulcan | 1855 | 0-6-0ST | Became GWR 2142 in 1876; wd 1884. |
| Samson | LMS 5738 | 4-6-0 | |||
| Samson | LNWR 2339 | NBL | 4-6-0 | Became LMS 5682; wd 4/1935. | |
| Samson | RH&DR 6 | Paxman | 1927 | 4-8-2 | Was originally to be named Maid of Kent; still in use as of 2009 |
| Sandown | SR 21 | 0-4-4T | Operated on the Isle of Wight | ||
| Sandringham | LNER 2800 | 4-6-0 | |||
| Sandwich | LMS 5641 | 4-6-0 | |||
| Sandwich | LNER 2504 | 4-6-2 | |||
| Sans Pareil | R&ER | 4-4-2 | 15" gauge; imported from Norway; hauled the first train over the regauged R&ER on August 28, 1915. | ||
| Sansovino | LNER 2552 | 4-6-2 | |||
| Sanspareil | LMS 5732 | 4-6-0 | |||
| Sappho | GWR | 4-4-0ST | |||
| Sarawak | LMS 5625 | 4-6-0 | |||
| Sarum Castle | GWR 5097 | 4-6-0 | |||
| Saskatchewan | LMS 5561 | 4-6-0 | |||
| Satellite | L&BR 26 | Rennie | 12/1841 | 2-2-2 | Became Joint Committee #49; transferred to LBSCR as #13; wd 6/1855. |
| Saturn | GWR | 2-2-2 | |||
| Saturn | L&BR | SR&Co | 7/1841 | 2-2-2 | Became Joint Committee #56; transferred to SER. |
| Saturn | SDR | Ince Forge | 1876 | 2-4-0ST | Ordered by SDR but not completed until after the GWR purchased the SDR; became GWR 1300 upon completion at Swindon; wd 1934. |
| Saunders | GWR | 0-6-0T | |||
| Saunders | SDR | 0-6-0ST | |||
| Sceptre | LNER 2568 | 4-6-2 | |||
| Scorpio | GWR | 2-4-0 | |||
| Scorpion | LNWR 1723 | Crewe 4492 | 8/1905 | 4-4-0 | Became LMS 5295; wd 12/1936. |
| Scotia | LNWR 395 | Crewe | 6/1892 | 2-4-0 | Wd 11/1919. |
| Scotia | LNWR 1584 | Crewe | 4-6-0 | Became LMS 5704; wd 9/1936. | |
| Scots Guardsman | LMS 6115 | 4-6-0 | |||
| Scott | LNWR 1132 | NBL | 4-6-0 | Became LMS 5674; rn 25674; wd 2/1946. | |
| Scott | LNWR 1514 | Crewe | 11/1890 | 2-4-0 | Wd 1/1914. |
| Scottish Borderer | LMS 6104 | 4-6-0 | |||
| Sea Eagle | LNER 4487 | 4-6-2 | |||
| Seaford | LBSCR 98 | Brighton | 12/1859 | 2-2-2T | Rn 298 in 11/1874; rn 214 in 5/1878; wd 9/1879. |
| Seaforth Highlander | LMS 6108 | 4-6-0 | |||
| Seagull | GWR 3453 | 4-4-0 | |||
| Seagull | LNER 4902 | 4-6-2 | |||
| Seahorse | LMS 5705 | 4-6-0 | |||
| Seaview | SR 17 | 0-4-4T | Operated on the Isle of Wight | ||
| Sebastopol (1st) | GWR | 4-2-2 | |||
| Sebastopol (2nd) | GWR | 4-2-2 | |||
| Sedgwick | LNWR 379 | Crewe | 10/1888 | 2-4-0 | Became LMS 5007; wd 2/1928. |
| Sedley | SDR | 4-4-0ST | |||
| Selkirkshire | LNER 2756 | 4-4-0 | |||
| Selsey Bill | SR 2037 | 4-4-2 | |||
| Senator | LNWR 305 | Crewe 4451 | 11/1904 | 4-4-0 | Became LMS 5307; rn 25307; wd 3/1937. |
| Seneca | GWR | 4-4-0ST | |||
| Serlby Hall | LNER 2831 | 4-6-0 | |||
| Servia | LNWR 2115 | Crewe 4516 | 11/1905 | 4-4-0 | Became LMS 5229; wd 4/1932. |
| Sevenoaks | SR 935 | 4-4-0 | |||
| Severn | GWR | 0-6-0 | |||
| Severus | GWR | 0-6-0 | |||
| Seychelles | LMS 5626 | 4-6-0 | |||
| Shah | GWR | 2-4-0T | |||
| Shah of Persia | LNWR 942 | Crewe | 4/1893 | 2-4-0 | Wd 1/1916. |
| Shakenhurst Hall | GWR 4966 | 4-6-0 | |||
| Shamrock | GWR | 2-4-0T | |||
| Shamrock | LNWR 1309 | Crewe 4676 | 8/1907 | 4-4-0 | Became LMS 5302; rn 25302; wd 6/1937. |
| Shanklin | LBSCR 332 | 7/1881 | 2-2-2 | Wd 3/1910. | |
| Shanklin | SR 20 | 0-4-4T | Operated on the Isle of Wight. | ||
| Shannon | GWR | 0-6-0 | |||
| Shap | LNWR 764 | 2-4-0 | Became LMS 5093. | ||
| Shark | LNWR 884 | Crewe | 4-6-0 | Became LMS 5656; wd 8/1938. | |
| Sharp | GWR | 2-4-0 | |||
| Shaw Savill | SR 21C9 | 4-6-2 | |||
| Sheffield United | LNER 2849 | 4-6-0 | |||
| Sheffield Wednesday | LNER 2861 | 4-6-0 | |||
| Sherborne | SR 906 | 4-4-0 | |||
| Sherpa | 0-4-0ST | 12¼" gauge; ex-Darjeeling-Himalaya Railway; used on the Fairbourne-Penrhyn Point line. | |||
| Sherwood Forester | LMS 6112 | 4-6-0 | |||
| Shirburn Castle | GWR 5030 | 4-6-0 | |||
| Shirenewton Hall | GWR 4967 | 4-6-0 | |||
| Shooting Star | BR 70029 | Crewe | 11/1952 | 4-6-2 | Wd 10/1967; scr 3/1968. |
| Shooting Star | GWR | 2-2-2 | |||
| Shooting Star | LNWR 2165 | Crewe 4503 | 10/1905 | 4-4-0 | Became LMS 5280; wd 11/1935. |
| Shoreham | L&BR 2 | JT&E | 4/1839 | 0-4-2 | Became Joint Committee #46. |
| Shorwell | SR 30 | 0-4-4T | Operated on the Isle of Wight. | ||
| Shotover | LNER 2580 | 4-6-2 | |||
| Shotton Hall | GWR 4968 | 4-6-0 | |||
| Shovell | LMS 5651 | 4-6-0 | |||
| Shrewsbury | GWR | 0-6-0 | |||
| Shrewsbury | SR 921 | 4-4-0 | |||
| Shrewsbury Castle | GWR 5009 | 4-6-0 | |||
| Shrugborough Hall | GWR 4969 | 4-6-0 | |||
| Sibyl | GWR | 0-6-0 | |||
| Siddington Hall | GWR 5948 | 4-6-0 | |||
| Sierra Leone | LMS 5627 | 4-6-0 | |||
| Silver Fox | LNER 2512 | 4-6-2 | |||
| Silver Jubilee | LMS 5552 | 4-6-0 | |||
| Silver King | LNER 2511 | 4-6-2 | |||
| Silver Link | LNER 2509 | Doncaster 1866 | 12/1937 | 4-6-2 | Ex-LNER 4464 Bittern; restored and returned to steam in 2007. |
| Simon Glover | LNER 9501 | 4-4-0 | |||
| Simoom | LNWR 2 | Crewe 4440 | 6/1904 | 4-4-0 | Became LMS 5308; wd 10/1936. |
| Singapore | LNER 2507 | 4-6-2 | |||
| Sir Aglovale | SR 781 | 4-6-0 | |||
| Sir Agravaine | SR 775 | 4-6-0 | |||
| Sir Alexander Cockburn | LNWR 506 | Crewe | 7/1896 | 2-4-0 | Became LMS 5062; wd 2/1932. |
| Sir Arhur Lawley | LNWR 695 | Crewe | 7/1916 | 4-6-0 | Became LMS 5921; wd 11/1934. |
| Sir Arthur Yorke | GWR 3418 | 4-4-0 | |||
| Sir Balan | SR 769 | 4-6-0 | |||
| Sir Balin | SR 768 | 4-6-0 | |||
| Sir Bedivere | SR 457 | 4-6-0 | |||
| Sir Berkeley Sheffield | LNER 5436 | 4-4-0 | |||
| Sir Blamor de Ganis | SR 797 | 4-6-0 | |||
| Sir Bors de Ganis | SR 763 | 4-6-0 | |||
| Sir Brian | SR 782 | 4-6-0 | |||
| Sir Cador of Cornwall | SR 804 | 4-6-0 | |||
| Sir Charles Cust | LNWR 207 | Crewe | 5/1921 | 4-6-0 | Named 12/1921; became LMS 6023; rb 1928; wd 7/1941. |
| Sir Charles Newton | LNER 4901 | Doncaster 1875 | 6/1938 | 4-6-2 | Ex-Capercaillie. |
| Sir Christopher Wren | BR 70039 | Crewe | 3/1953 | 4-6-2 | Wd 9/1967; scr 2/1968. |
| Sir Clement Royds | LNER 5435 | 4-4-0 | |||
| Sir Colgrevance | SR 779 | 4-6-0 | |||
| Sir Constantine | SR 805 | 4-6-0 | |||
| Sir Daniel Gooch | GWR 5070 | 4-6-0 | |||
| Sir David Stewart | GNSR | 4-4-0 | Became LNER 6847; became BR 62275. | ||
| Sir Dinadan | SR 795 | 4-6-0 | |||
| Sir Dodinas le Savage | SR 796 | 4-6-0 | |||
| Sir Durnore | SR 802 | 4-6-0 | |||
| Sir Ector de Maris | SR 794 | 4-6-0 | |||
| Sir Edward Elgar | GWR 3414 | 5/1906 | 4-4-0 | Ex-A. H. Mills in July 1914. | |
| Sir Edward Fraser | LNER 5432 | 4-4-0 | |||
| Sir Francis Dent | LNWR 2221 | Crewe | 8/1916 | 4-6-0 | Became LMS 5927; rb 1928; wd 12/1936. |
| Sir Francis Drake | SR 851 | 4-6-0 | |||
| Sir Frank Ree | LMS 5530 | 4-6-0 | |||
| Sir Frank Ree | LNWR 1191 | Crewe | 5/1913 | 4-6-0 | Became LMS 5902; wd 11/1930. |
| Sir Frederick Banbury | LNER 4471 | 4-6-2 | |||
| Sir Frederick Harrison | LMS 5531 | 4-6-0 | |||
| Sir Frederick Harrison | LNWR 1319 | Crewe | 5/1913 | 4-6-0 | Became LMS 5907; wd 1/1933. |
| Sir Gaharis | SR 774 | 4-6-0 | |||
| Sir Galagars | SR 776 | 4-6-0 | |||
| Sir Galahad | SR 456 | 4-6-0 | |||
| Sir Galleron | SR 806 | 4-6-0 | |||
| Sir Gareth | SR 764 | 4-6-0 | |||
| Sir Gawain | SR 764 | 4-6-0 | |||
| Sir Geraint | SR 766 | 4-6-0 | |||
| Sir Gilbert Claughton | LNWR 2222 | Crewe | 1/1913 | 4-6-0 | Became LMS 5900; wd 3/1935. |
| Sir Gillemere | SR 783 | 4-6-0 | |||
| Sir Guy | SR 789 | 4-6-0 | |||
| Sir Guy Calthrop | LNWR 1093 | Crewe | 7/1916 | 4-6-0 | Ex-Guy Calthrop in March 1919; became LMS 5923; wd 6/1935. |
| Sir Hardman Earl | LNWR 890 | Crewe | 2/1895 | 2-4-0 | Became LMS 5051; wd 10/1928. |
| Sir Harry le Fise Lake | SR 803 | 4-6-0 | |||
| Sir Hectimere | SR 798 | 4-6-0 | |||
| Sir Herbert Walker, K.C.B. | LMS 5535 | 4-6-0 | |||
| Sir Herbert Walker, K.C.B. | LNWR 2204 | Crewe | 8/1916 | 4-6-0 | Became LMS 5926; wd 1/1933. |
| Sir Hervis de Revel | SR 792 | 4-6-0 | |||
| Sir Hugo | LNER 2582 | 4-6-2 | |||
| Sir Ironside | SR 799 | 4-6-0 | |||
| Sir John French | LNWR 1333 | Crewe | 4-6-0 | Became LMS 5646; wd 12/1934. | |
| Sir John Hawkins | SR 865 | 4-6-0 | |||
| Sir John Moore | BR 70041 | Crewe | 3/1953 | 4-6-2 | Wd 4/1967; scr 10/1967. |
| Sir Kay | SR 450 | 4-6-0 | |||
| Sir Lamiel | SR 777 | 4-6-0 | |||
| Sir Lamorak | SR 451 | 4-6-0 | |||
| Sir Launcelot | SR 455 | 4-6-0 | |||
| Sir Lavaine | SR 773 | 4-6-0 | |||
| Sir Lionel | SR 786 | 4-6-0 | |||
| Sir Mador de la Porte | SR 785 | 4-6-0 | |||
| Sir Martin Frobisher | SR 864 | 4-6-0 | |||
| Sir Massey Lopes | GWR 3371 | 4-4-0 | |||
| Sir Meleaus de Lile | SR 800 | 4-6-0 | |||
| Sir Meliagrance | SR 452 | 4-6-0 | |||
| Sir Meliot de Logres | SR 801 | 4-6-0 | |||
| Sir Menadeuke | SR 787 | 4-6-0 | |||
| Sir Murrough Wilson | LNER 4499 | 4-6-2 | |||
| Sir Nerovens | SR 784 | 4-6-0 | |||
| Sir Nigel Gresley | LNER 4498 | 4-6-2 | |||
| Sir Ontzlake | SR 793 | 4-6-0 | |||
| Sir Pelleas | SR 778 | 4-6-0 | |||
| Sir Percivale | SR 772 | 4-6-0 | |||
| Sir Persant | SR 780 | 4-6-0 | |||
| Sir Prianius | SR 770 | 4-6-0 | |||
| Sir Ralph Wedgewood | LNER 4469 | Doncaster 1871 | 3/1935 | 4-6-2 | Ex-Gadwell. |
| Sir Richard Grenville | SR 853 | 4-6-0 | |||
| Sir Robert Turnbull | LMS 5540 | 4-6-0 | |||
| Sir Robert Turnbull | LNWR 1161 | Crewe | 5/1913 | 4-6-0 | Became LMS 5901; wd 5/1933. |
| Sir Ronald Matthews | LNER 4500 | Doncaster 1873 | 4/1938 | 4-6-2 | Ex-Garganey. |
| Sir Sagramore | SR 771 | 4-6-0 | |||
| Sir Sam Fay | GCR | 4-6-0 | Became LNER 5423. | ||
| Sir Thomas Brooke | LNWR 2025 | 12/1910 | 4-4-0 | Became LMS 5325; rn 25325; wd 5/1937. | |
| Sir Thomas Williams | LNWR 155 | Crewe | 3/1917 | 4-6-0 | Ex-I. T. Williams; became LMS 5932; wd 4/1935. |
| Sir Torre | SR 449 | 4-6-0 | |||
| Sir Tristram | SR 448 | 4-6-0 | |||
| Sir Urre of the Mount | SR 788 | 4-6-0 | |||
| Sir Uwaine | SR 791 | 4-6-0 | |||
| Sir Valence | SR 767 | 4-6-0 | |||
| Sir Villiars | SR 790 | 4-6-0 | |||
| Sir Visto | LNER 2567 | 4-6-2 | |||
| Sir W. S. Gilbert | LNWR 985 | Crewe | 4-6-0 | Became LMS 5633; wd 8/1935. | |
| Sir Walter Raleigh | SR 852 | 4-6-0 | |||
| Sir Walter Scott | LNER 9898 | 4-4-0 | |||
| Sir Watkin | GWR | 0-6-0T | |||
| Sir Watkin Wynn | GWR 3375 | 4-4-0 | |||
| Sir William Pollitt | LNER 5365 | 4-4-2 | |||
| Sirius | GWR | 0-6-0 | |||
| Sirius | L&BR | SR&Co | 7/1841 | 2-2-2 | Became Joint Committee #59; transferred to SER. |
| Sirius | LNWR 424 | 2-4-0 | Became LMS 5107. | ||
| Sirocco | LNWR 643 | Crewe 4452 | 11/1904 | 4-4-0 | Became LMS 5297; rn 25297; became BR 58010 but this number was never applied to the locomotive's livery; wd 6/1949. |
| Sister Dora | LNWR 2158 | 2-4-0 | Became LMS 5105. | ||
| Sketty Hall | GWR 4970 | 4-6-0 | |||
| Skibo Castle | LMS 14681 | 4-6-0 | |||
| Skiddaw | LNWR 486 | 2-4-0 | Became LMS 5098. | ||
| Skylark | GWR 3454 | 4-4-0 | |||
| Slaughter | GWR | 2-4-0 | |||
| Smeaton | GWR | 2-4-0 | |||
| Smeaton | LNWR 484 | Crewe | 4-6-0 | Became LMS 5655; wd 12/1934. | |
| Smeaton | LNWR 1485 | Crewe | 12/1887 | 2-4-0 | Wd 5/1914. |
| Snake | GWR | 2-2-2 | |||
| Snake | LNWR 127 | Crewe 4517 | 11/1905 | 4-4-0 | Became LMS 5223; rn 25223; wd 11/1936. |
| Snipe | LNWR 1730 | 10/1911 | 4-4-0 | Became LMS 5376; rn 25376; wd 12/1947. | |
| Snowdon | LNWR 2191 | 4/1875 | 2-4-0 | Became LMS 5001; rn 25001 in 1934; wd 10/1934. | |
| Sol | SDR | 4-4-0ST | |||
| Solario | LNER 4473 | 4-6-2 | |||
| Solomon Islands | LMS 5603 | 4-6-0 | |||
| Solway Firth | BR 70049 | Crewe | 7/1954 | 4-6-2 | Wd 12/1967; scr 3/1968. |
| Somaliland | LMS 5628 | 4-6-0 | |||
| Somerleyton Hall | LNER 2840 | 4-6-0 | |||
| Somme | LNER 5503 | 4-4-0 | |||
| Somme | LNER 9646 | 0-6-0 | |||
| South Africa | LMS 5571 | 4-6-0 | |||
| South Africa | LNWR 2212 | 6/1911 | 4-4-0 | Became LMS 5355; wd 7/1936. | |
| South Australia | LMS 5567 | 4-6-0 | |||
| South Foreland | SR 2421 | 4-4-2 | |||
| Southbourne | LBSCR 350 | 5/1882 | 2-2-2 | Wd 7/1908. | |
| Southdown | LBSCR 37 | Brighton | 1878 | 0-6-0T | Rn 637 Locomotive Department; sold to the Admiralty in 2/1908; sold to Dalmore Distillery; scr 8/1921. |
| Southend-on-Sea | 80 | 4-4-2T | Renamed Thundersley in 1910; became MR 2177; rn LMS 2148; became BR 41966; wd June 1956; preserved at the National Railway Museum. | ||
| Southern Maid | RH&DR 3 | Paxman | 1926 | 4-6-2 | Was originally to be named Southern Chief but renamed before construction was completed; Still in use as of 2009 |
| Southern Rhodesia | LMS 5595 | 4-6-0 | |||
| Southesk | LNER 6854 | 4-4-0 | |||
| Southport | LMS 5527 | 4-6-0 | |||
| Southsea | LBSCR 154 | Brighton | 8/1862 | 2-2-2 | Named in 1871; rn 165 in 11/1871; wd 4/1890. |
| Sparkford Hall | GWR 5997 | 4-6-0 | |||
| Sparrow Hawk | LNER 4463 | 4-6-2 | |||
| Spearmint | LNER 2796 | 4-6-2 | |||
| Speke | LNWR 1684 | Crewe | 6/1891 | 2-4-0 | Became LMS 5029; wd 9/1931. |
| Sphinx | GWR | 0-6-0 | |||
| Sphinx | LNWR 1466 | NBL | 4-6-0 | Became LMS 5675; wd 8/1936. | |
| Sphinx | LNWR 2156 | 2-4-0 | Transferred to LMS; rn Engineer Manchester in 1923. | ||
| Spion Kop | LNER 2752 | 4-6-2 | |||
| Spit Fire | GWR | 2-2-2 | |||
| Spitfire | GWR 5071 | 4-6-0 | |||
| Spitfire | LNWR 742 | 2-4-0 | Transferred to LMS in 1923; rn Engineer Liverpool. | ||
| Spithead | LBSCR 153 | Brighton | 8/1862 | 2-2-2 | Named in 1872; rn 164 in 5/1872; wd 1/1891. |
| Splugen | LBSCR 309 | Brighton | 7/1883 | 0-4-2 | Rn 609 in 9/1906; wd 3/1907. |
| Springbok | LNER 8301 | 4-6-0 | |||
| St. Alban's Head | SR 2426 | 4-4-2 | |||
| St. Donats Castle | GWR 5017 | 4-6-0 | |||
| St. Dunstan's | LMS 5501 | 4-6-0 | |||
| St. Fagans Castle | GWR 5067 | 4-6-0 | |||
| St. Frusquin | LNER 2574 | 4-6-2 | |||
| St. Gatien | LNER 2572 | 4-6-2 | |||
| St. George | LNWR 681 | 4/1913 | 4-4-0 | Became LMS 5390; wd 11/1935. | |
| St. Helena | LMS 5624 | 4-6-0 | |||
| St. Lawrence | LBSCR 342 | 1/1882 | 2-2-2 | Wd 1/1911. | |
| St. Lawrence | SR 934 | 4-4-0 | |||
| St. Malo | SR 93 | 4-4-0 | |||
| St. Mawes Castle | GWR 5018 | 4-6-0 | |||
| St. Olave's | SR 938 | 4-4-0 | |||
| St. Paul's | SR 909 | 4-4-0 | |||
| St. Peters School, York, A.D. 627 | LNER 4818 | 2-6-2 | |||
| St. Simon | LNER 4481 | 4-6-2 | |||
| St. Vincent | LMS 5686 | 4-6-0 | |||
| Stackpole Court | GWR 2948 | 4-6-0 | |||
| Stag | SDR | Avonside | 1872 | 4-4-0ST | Became GWR 2129 in 1876; pulled the last broad gauge train on the St Ives branch on May 20, 1892, then pulled the empty broad gauge cars back to Swindon; kept as broad gauge for shunting at Swindon; scr 1893. |
| Staghound | LNWR 1792 | 5/1911 | 4-4-0 | Became LMS 5353; wd 6/1936. | |
| Stanford Court | GWR 2949 | 4-6-0 | |||
| Stanford Hall | GWR 5937 | 4-6-0 | |||
| Stanley Hall | GWR 5938 | 4-6-0 | |||
| Stanway Hall | GWR 4971 | 4-6-0 | |||
| Star | NDR | 2-2-2 | |||
| Starling | GWR 3455 | 4-4-0 | |||
| Statius | GWR | 4-4-0ST | |||
| Stentor | GWR | 2-2-2 | |||
| Stentor | LNWR 522 | Crewe | 4-6-0 | Became LMS 5723; wd 1/1936. | |
| Stephenson | GWR | 2-4-0 | |||
| Stephenson | LBSCR 329 | 5/1881 | 2-2-2 | Rn 329A in 12/1909; wd 5/1914. | |
| Stephenson | SR 2329 | 4-6-0 | |||
| Steropes | GWR | 0-6-0 | |||
| Stewart | GWR | 2-4-0 | |||
| Stewart | GWR | 2-4-0T | |||
| Stewart | LNWR 1189 | Crewe | 6/1897 | 2-4-0 | Wd 12/1922. |
| Stiletto | GWR | 2-2-2 | |||
| Stirlingshire | LNER 264 | 4-4-0 | |||
| Stokesay Castle | GWR 5040 | 4-6-0 | |||
| Stork | LNWR 229 | Crewe 4518 | 11/1905 | 4-4-0 | Became LMS 5224; wd 11/1927. |
| Stowe | SR 928 | 4-4-0 | |||
| Stowe Grange | GWR 6856 | 4-6-0 | |||
| Straits Settlements | LMS 5629 | 4-6-0 | |||
| Stromboli | GWR | 2-4-0 | |||
| Stromboli | SDR | 0-6-0ST | |||
| Stroud | B&GR | 2-2-2 | |||
| Stroudley | SR 2332 | 4-6-0 | |||
| Sturdee | LMS 5647 | 4-6-0 | |||
| Sultan (1st) | GWR | 4-2-2 | |||
| Sultan (2nd) | GWR | 4-2-2 | |||
| Sultan | LNWR 1938 | 10/1900 | 4-4-0 | Rb 2/1920; became LMS 5161. | |
| Sun | GWR | 2-2-2 | |||
| Sunbeam | GWR | 2-2-2 | |||
| Sunbeam | LNWR 2062 | Crewe 4493 | 8/1905 | 4-4-0 | Became LMS 5279; rn 25279; wd 8/1939. |
| Sunderland | LNER 2851 | Darlington | 3/1936 | 4-6-0 | Ex-Derby County; rn back to Derby County in 1937. |
| Sunderland | LNER 2854 | 4-6-0 | |||
| Sunstar | LNER 2571 | 4-6-2 | |||
| Superb | LNWR 1937 | 10/1900 | 4-4-0 | Rb 1/1919; became LMS 5154. | |
| Sutherland | LBSCR 328 | 2/1881 | 2-2-2 | Wd 4/1908. | |
| Sutton Nelthorpe | LNER 5439 | 4-6-0 | |||
| Suvla Bay | LNWR 233 | Crewe | 4-6-0 | Became LMS 5665; wd 4/1936. | |
| Swallow (1st) | GWR | 4-2-2 | |||
| Swallow (2nd) | GWR | 4-2-2 | |||
| Swallowfield Park | GWR 4007 | 4-6-0 | |||
| Swaziland | LMS 5630 | 4-6-0 | |||
| Sweeney Hall | GWR 4973 | 4-6-0 | |||
| Swiftsure | LMS 5716 | 4-6-0 | |||
| Swiftsure | LNWR 806 | Crewe 4462 | 1/1905 | 4-4-0 | Became LMS 5318; wd 10/1935. |
| Swindon | GWR | 0-6-0 | |||
| Swordfish | GWR 5082 | 4-6-0 | |||
| Sydney Smith | LNWR 1089 | Crewe | 4-6-0 | Became LMS 5613; wd 2/1935. | |
| Sylla | GWR | 0-6-0 | |||
| Sylph | GWR | 2-2-2 |