See also: Narrow-gauge small locomotives of the Deutsche Reichsbahn. Class 99 is the classification of German narrow gauge locomotives used by the Deutsche Reichsbahn or its successor administrations. It is therefore divided into numerous sub-classes that are listed in this table.
| DR or DB class | former class | Rail gauge | Axle arrangement | |
|---|---|---|---|---|
| B n2t | ||||
| 1.000 mm | C n2t | |||
| 1.000 mm | B h2t | |||
| 1.000 mm | B n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C h2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | 1'C h2t | |||
| 1.000 mm | D n2t | |||
| 1.000 mm | B'B' n4vt | |||
| 1.000 mm | D n2t | |||
| (Prussian T 40) | 1.000 mm | E h2t | ||
| (Württemberg Ts 5) | 1.000 mm | E h2t | ||
| 1.000 mm | C'C h4vt | |||
| New class for the Wangerooge Island railway | 1.000 mm | C n2t | ||
| Einheitslokomotive | 1.000 mm | 1'E1' h2t | ||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | C n2t | |||
| DR Neubaulokomotive | 1.000 mm | 1'E1' h2t | ||
| 1.000 mm | 1'C n2t | |||
| 1.000 mm | C 1' n2t | |||
| 1.000 mm | D h2t | |||
| 1.000 mm | 1'C n2t | |||
| ZVTM Nos. 21 | 1.000 mm | B n2t | ||
| 1.000 mm | B'B' n2t | |||
| ex-French loco | 1.000 mm | C n2t | ||
| 1.000 mm | C n2t | |||
| Tram d' Ardèche | 1.000 mm | C n2t | ||
| C n2t | ||||
| (Mecklenburg T 42) | 900 mm | D n2t | ||
| Einheitslokomotive | 900 mm | 1'D1' h2t | ||
| SDAG Wismut Nos. 1, 22, 44 | 900 mm | D h2t / D n2t | ||
| D n2t | ||||
| 785 mm | D h2t | |||
| 785 mm | E h2t | |||
| 785 mm | E h2t | |||
| C n2t | ||||
| 750 mm | B'B' n4vt | |||
| 750 mm | D n2vt | |||
| 750 mm | D n2t | |||
| 750 mm | B'B n4vt | |||
| 750 mm | E h2t | |||
| DRG copy | 750 mm | E h2 t | ||
| Einheitslokomotive | 750 mm | 1'E1' h2t | ||
| DR Neubaulokomotive | 750 mm | 1'E1' h2t | ||
| 750 mm | C 1' n2t | |||
| C 1' n2vt | ||||
| 760 mm | C 1' h2t | |||
| 760 mm | D n2t | |||
| 760 mm | C 2' n2vt | |||
| 760 mm | D 1' h2t | |||
| 760 mm | D 2' n2vt | |||
| 760 mm | D 2' h2t | |||
| 760 mm | E h2t | |||
| 760 mm | 1'D 1' n2t | |||
| 750 mm | D h2 | |||
| PKP Class B | 600 mm | B n2t | ||
| PKP Class C 1 | 600 mm | C n2t | ||
| PKP Class C 3 | 600 mm | C h2t | ||
| PKP Class D 1, D 3 | 600 mm | D n2t | ||
| PKP Class D | 600 mm | D h2t | ||
| PKP Class E, Es | 600 mm | E n2t | ||
| PKP Nos. 1334 | 600 mm | E n2 | ||
| PKP Nos. 4223+4262, LG Nos. K 4-402 | 600 mm | E n2 | ||
| 600 mm | C'C' h4t | |||
| 750 mm | C n2t | |||
| 750 mm | C n2t | |||
| 750 mm | C1' n2t | |||
| 750 mm | D n2t | |||
| PKP Class D 8, PKP Nos. 1690 | 750 mm | D n2vt D n2t | ||
| 750 mm | D n2vt | |||
| 750 mm | D h2t | |||
| 1000 mm | 1'C n2t | |||
| MPSB no nos. | 600 mm | B n2(t) | ||
| WEM No. 1 Graf Arnim | 600 mm | C n2(t) | ||
| WEM Nos. 2–7 | 600 mm | D n2t | ||
| 600 mm | C 1' n2(t) | |||
| 600 mm | D h2 | |||
| MPSB No. 8II | 600 mm | C 1' h2(t) | ||
| 600 mm | D h2 | |||
| 600 mm | B n2t | |||
| Heeresfeldbahnlok | 750 mm | C n2t | ||
| 750 mm | D n2 | |||
| 750 mm | C n2t | |||
| 750 mm | ||||
| Prignitzer KKB 14–17, 21–22, 23 | 750 mm | C n2t | ||
| 750 mm | C 1' n2t | |||
| Lenz-Typ nn (RüKB Nos. 31nn–35nn) | 750 mm | B'B n4vt | ||
| 750 mm | D n2t | |||
| 750 mm | D h2 | |||
| 750 mm | D n2 /D n2t | |||
| Lenz-Typ m (DKBO No. 2m, RüKB 7m, 9m) | 750 mm | B n2t | ||
| Trusebahn No. 6; KKP 1, 2; KJI Nos. 9, 10 | 750 mm | C n2t | ||
| Prussian T 36 (RüKB No. 265) | 750 mm (785 mm) | C 2' n2t | ||
| 750 mm | D h2t | |||
| 750 mm | D n2t | |||
| 750 mm | C n2 | |||
| 750 mm | C n2t | |||
| PKKB Nos. 20 | 750 mm | C 1' n2t | ||
| 750 mm | B n2t | |||
| 750 mm | 1' D h2t (D h2t) | |||
| 1.000 mm | B h2t | |||
| 1.000 mm | B n2t | |||
| Lenz-Typ i (FKB Nos. 1–6, PLB Nos. 119–124) | 1.000 mm | B n2t | ||
| Salzwedeler Kleinbahn No. 5 (FKB No. 9°, PLB No. 130) | 1.000 mm | C n2t | ||
| Lenz-Typ ii (FKB Nos. 7, 8, PLB Nos. 165, 166) | 1.000 mm | B'B n4vt | ||
| (NWE Nos. 71 and 72) | 1.000 mm | C 1' n4vt | ||
| 1.000 mm | 1' C n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | B'B n4vt | |||
| 1.000 mm | B n2t | |||
| 1.000 mm | C n2t | |||
| 1.000 mm | B'B n4vt | |||
| 1.000 mm | D h2t | |||
| 1.000 mm | 1'C1' h2t | |||
| 1.000 mm | (1'B)'B1' h4vt | |||
| 1.000 mm | C h2t/C n2t | |||
| 1.000 mm | C n2t | |||
| Mosbach–Mudau Nos. 1 to 4 (aka Baden C) | 1.000 mm | C n2t | ||
| 1.000 mm | 2 1' n2(b)t | |||
| 750 mm | C n2t | |||
| 750 mm | C 1'n2t | |||
| 760 mm | C 1'n2t | |||
| 760 mm | C 1'n2t | |||
| 760 mm | C 1'n2t | |||
| 760 mm | C 1'n2t |