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In the first 36 years of its existence, the NSW Railways introduced 42 separate classes of locomotives. The appointment by the Premier of New South Wales, Henry Parkes of Mr E.M.G Eddy as Chief Commissioner in 1888 created an independent railway department and saw the following 36 years with only sixteen new classes produced. [1]
Steam Locomotive classification on the New South Wales Government Railways had three distinct classification systems.
The classification was taken from the road number given to the first engine in each class.
The engines attached to the then isolated Northern section had the terminal letter "N" added to the road number.
A letter was selected arbitrarily and placed before the first number allotted to each class. e.g. the 93-class became the A.93-class. Letters were initially allocated, in alphabetic order, by class size. The 93 Class had the most locomotives in traffic (77) so they were given the letter 'A', the 205 Class were the next most numerous (70 in traffic), so were classified 'B', the 79 Class the third most numerous (68 in service) so were granted the letter 'C' and so on. With the opening of the Hawkesbury Bridge in May 1889, the Northern section engines were renumbered and grouped with the others of the Sydney system, using the numbers 388-435. the final "N" being dropped .
In general practice, the class letter only was quoted, without the number, except when there were one or two variants using a common class-letter.
All engines were given new four-figure numbers, the first two digits indicating the class and the second two, the engine number, arranged in chronological order of commencement of service. When the number of engines in a class exceeded 99, 100 was added to the number, e.g., the 137th engine of the 32-class was 3337. Engines numbered from 1000 up were the first to be renumbered using the new system to prevent two locomotives sharing the same number being in service at the same time.
The initial letters indicate :
Initial letters are dropped in general usage with a "C.36-class" engine universally known as a "36-class".
| Image | Whyte notation | pre 1890 | 1890-1924 | post 1924 | Type | Year |
|---|---|---|---|---|---|---|
 | 0-4-2 | 1 | Mixed Traffic | 1855 | ||
 | 0-4-2 | 5 | Mixed Traffic | 1856 | ||
 | 2-2-2 | 6 | Passenger | 1856 | ||
 | 0-4-2 | 1N | Mixed Traffic | 1857 | ||
 | 2-2-2T | 8 | Passenger Tank | 1859 | ||
 | 2-2-2 | 9 | Passenger, Coal | 1858 | ||
 | 2-4-0 | 13 | Mixed Traffic | 1863 | ||
 | 0-6-0 | 17 | E.17 | Goods | 1863 | |
 | 2-4-0 | 23 | G.23 | Passenger | 1863 | |
 | 2-4-0T | 6N | Mineral Tank Type | 1863 | ||
 | 2-2-2 | 8N | Passenger | 1864 | ||
 | 0-6-0T | 29-31,9N | S.29 | Box Saddle Tank | 1864 | |
 | 2-2-2 | 14 | T.14 | Express Passenger | 1865 | |
 | 0-4-2 | 36 | M.36 | X.10 | Mixed Traffic | 1870 |
 | 2-4-0 | 10 [2] | Passenger | 1870 | ||
 | 0-6-0T | 20N | Goods Saddle Tank | 1872 | ||
 | 0-6-0T | (1st) 48 | Goods Tank | 1872 | ||
 | 0-6-0 | 23N | Goods | 1874 | ||
 | 0-6-0 | (2nd)48 | I.48 | Goods | 1874 | |
 | 0-6-0 | 60 | O.60 | Passenger | 1874 | |
 | 0-6-0T | 66 | P.127 | Small Saddle Tank | 1874 | |
 | 0-6-0T | 67 | N.67 | Suburban Passenger Tank | 1875 | |
 | 4-4-0 | 79 | C.79 | Z.12 | Passenger | 1877 |
 | 4-4-2T | 79 | CC.79 | Z.13 | Suburban Passenger Tank | 1877 |
 | 0-6-0 | 93 | A.93 | Z.19 | Goods | 1877 |
 | 4-4-0 | 105 | U.105 (later S.105) | Passenger | 1877 | |
 | 2-8-0 | 131 | J.131 | Z.28 | Goods | 1879 |
 | 4-4-0 | 158 | Q.158 | Light Mixed Traffic | 1880 | |
 | 2-6-0 | 205 | B.205 | Z.25 | Goods | 1882 |
 | 4-4-0 | 255 | D.255 | Z.15 | Express Passenger | 1882 |
 | 4-4-0 | 261 | D.261 | Z.16 | Express Passenger | 1883 |
 | 0-6-0T | 285 | R.285 | Z.18 | Suburban Passenger Tank | 1884 |
 | 2-6-0 | 294 | K.294 | Goods | 1885 | |
 | 2-6-0 | 304 | L.304 | Z.21 | Passenger | 1885 |
 | 4-4-0 | 334 | D.334 | Z.16 | Express Passenger | 1885 |
 | 2-4-0T | 351 | F.351 | X.10 | Suburban Passenger Tank | 1885 |
 | 4-4-0 | 373 | H.373 | Z.17 | Passenger | 1887 |
 | 2-6-0 | L.436 | Z.22 | Passenger | 1890 | |
 | 4-4-2T | M.40 | Z.11 | Suburban Passenger Tank | 1891 | |
 | 2-6-0 | B.55 | Z.24 | Goods | 1891 | |
 | 2-6-2T | I.17 | Z.26 | Mineral Tank | 1891 | |
 | 2-6-4T | E.10 | Z.20 | Mineral Tank | 1891 | |
 | 4-6-0 | O.446 | Z.23 | Passenger | 1891 | |
 | 2-8-0 | J.483 | Z.29 | Goods | 1891 | |
 | 4-6-0 | P.6 | C.32 | Passenger | 1892 | |
 | 2-8-0 | J.522 | Z.28 | Goods | 1893 | |
 | 2-8-0 | T.524 | D.50 | Goods | 1896 | |
 | 2-6-4T | A/E | Z.20 | Mineral Tank E.10 rebuild | 1902 | |
 | 4-4-0 | CG | Z.14 | (C)onverted (G)-Class | 1903 | |
 | 4-6-4T | S.636 | C.30 | Suburban Passenger Tank | 1903 | |
 | 4-6-0 | N.928 | C.34 | Express Passenger | 1909 | |
 | 4-4-0T | 158 | Q.158 | Suburban Passenger Tank | 1910 | |
 | 2-8-0 | TF.939 | D.53 | Goods | 1912 | |
 | 4-6-0 | NN.1027 | C.35 | Express passenger | 1914 | |
 | 2-6-0 | G.1204 | Z.27 | Goods | 1917 | |
 | 2-8-0 | K.1353 | D.55 | Goods | 1918 | |
 | 4-6-0 | C.36 | Express passenger | 1925 | ||
 | 4-6-0 | C.30T | Branch line work | 1928 | ||
 | 4-8-2 | D.57 | Heavy Goods | 1929 | ||
 | 4-6-2 | C.38 | Express passenger | 1943 | ||
 | 4-8-2 | D.58 | Heavy Goods | 1950 | ||
 | 4-8-4+4-8-4 | AD.60 | Heavy Goods | 1952 | ||
 | 2-8-2 | D.59 | Goods | 1952 |
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