The Leipzig–Dresden Railway Company (Leipzig-Dresdner Eisenbahn or LDE) started up its operations between 1837 and 1839, successively opening its sections of line, and was therefore the first German long distance railway. It remained independent for nearly three decades and was only absorbed into the Royal Saxon State Railways on 1 June 1876.
Initially all locomotives were classified by name as was common practice. This was usual on all engines up to 1892. From 1893 to 1900 only passenger and express train locomotives still carried name plates. Thereafter name plates on all locomotives, apart from old shunting and branch line engines, were removed.
Specific groups of names were supposed to be allocated to the different classes (e.g. rivers, alpine peaks, American cities).
In addition to their names the locomotives were given 'list numbers' (Listennummern or Bahnnummern) that were also displayed on the engines from 1869 onwards. A new numbering scheme was introduced in 1892, which attempted to bring in some sort of orderly system. However it was not successful.
Because this system was confusing and impractical with the ever-rising quantity of locomotives, in 1869 a system of distinguishing between the individual classes was introduced in 1869. This system was based on an abbreviation of the manufacturer's name and a Roman numeral for each type of locomotive.
Only two years later this system was changed and the numbers were used to classify engines based on specific wheel arrangements, the manufacturer's abbreviations being retained. In addition the letters "a" (for alt = 'old') and "b" (for neu = 'new') were added.
In 1885 the supplementary letter "b" was given the meaning 'movable carrying axle'. The last major reorganisation of the classification system took place in 1896. The manufacturer's name was dropped. New classes of express train and goods train locomotives were given even class numbers and goods train, branch line and shunting locomotives were given odd numbers. Narrow gauge locomotives were given new class designations beginning with I. Locomotives of the same class however with different driving wheel diameters were given the additional number 1 (express train locomotives) and 2 (passenger train locomotives).
Various types, even rebuilt to tank locomotives, formerly classified as St I, St I (ex St II), St II (ex St III), St IIT, C I, B I, B II, H I (H IT), K I (K IT),
Various types, even rebuilt to tank locomotives, formerly classified as H II (H IIT/H IIaT), H III, B IIa (B III, B II), B II (B IV, B III), W II (W I, W III)
Rebuilt from Class K III with Nowotny bogie, new Class K IIIb
288–491
34 7701–7702, 34 7721–7807
204
1873–1901
1′B n2
Originally Schw IIIb, H IIIb and Hsch IIIb; Nos. 310–319 taken over in 1876 with the Muldenthal Railway; Nos. 335–337 taken over in 1876 with the Zwickau-Falkenstein Railway; Nos. 338–345 taken over in 1876 with the Chemnitz-Komotau Railway; No. 485 taken over in 1896 with the Altenburg-Zeitz Railway; Nos. 486–491 taken over with the Zittau-Reichenberg Railway
Originally classes H V, Schw V and Hsch V; 6 units sold in 1868 to the Berlin-Görlitz Railway; 12 units returned in 1877 to Hartmann for sale to the Russian Army; Nos. 880–884 taken over in 1882 with the Saxon-Thuringian East-West Railway; Nos. 861–865 taken over in 1888 with the Saxon section of the former Berlin-Dresden Railway
921–936, 972–979, 985–990, from 1900: 2921…2990
30
1868–1876
C n2
Originally classes K V, Sigl V and Hsch V; Taken over in 1876 with the LDE
991, from 1900: 2991
1
1886
C n2
Originally Class U V; same as Prussian G 3; taken over in 1888 with the Saxon section of the former Berlin-Dresden Railway
Valtin, Wolfgang (1992). Deutsches Lok-Archiv: Verzeichnis aller Lokomotiven und Triebwagen Band 1 - Nummerierungssysteme (in German). Berlin: transpress. ISBN3-344-70739-6.
Valtin, Wolfgang (1992). Deutsches Lok-Archiv: Verzeichnis aller Lokomotiven und Triebwagen Band 2 - Dampflokomotiven und Dampftriebwagen (in German). Berlin: transpress. ISBN3-344-70740-X.
Valtin, Wolfgang (1992). Deutsches Lok-Archiv: Verzeichnis aller Lokomotiven und Triebwagen Band 3 - Elektro- und Dieselloks, Triebwagen (in German). Berlin: transpress. ISBN3-344-70741-8.