In the 1920s, the Dutch Railways invested heavily in the reinforcement of the railway track, as a result of which the maximum permitted axle load on most main lines could be increased from 16 to 18 tons. This created for the first time the possibility of designing a 2'C2' tank engine, which was completely derived from the 1910-originating four-cylinder series NS 3700. Until then, lighter two-cylinder locomotives of the series NS 6000 with a maximum axle load of 15.4 tons represented the limited possibility for a Dutch tank engine.
The first five locomotives were built by Hohenzollern in 1929 and five more were built by Werkspoor later that year.
| Builder |
Lot No. |
Entered service |
NS number |
Notes |
| Hohenzollern |
4664 |
06-02-1929 |
6101 |
Found after the war in Emmerich |
| Hohenzollern |
4665 |
23-02-1929 |
6102 |
Found after the war in Buchholz |
| Hohenzollern |
4666 |
05-03-1929 |
6103 |
Destroyed by a direct hit during the war |
| Hohenzollern |
4667 |
02-03-1929 |
6104 |
Found after the war in Oldenburg |
| Hohenzollern |
4668 |
19-03-1929 |
6105 |
Missing after the war |
| Werkspoor |
586 / 2438 |
28-09-1929 |
6106 |
Found after the war in Emmerich |
| Werkspoor |
587 / 2439 |
04-10-1929 |
6107 |
Found in Uelzen after the war |
| Werkspoor |
588 / 2440 |
15-10-1929 |
6108 |
|
| Werkspoor |
589 / 2441 |
25-10-1929 |
6109 |
Found in Barsinghausen after the war |
| Werkspoor |
590 / 2442 |
12-11-1929 |
6110 |
|