NS 1900

NS 1900
Type and origin Power type Steam Builder Werkspoor Build date 1907-1913 Total produced 40
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2'B Leading dia. 991 mm (3 ft 3.0 in) Driver dia. 2,016 mm (6 ft 7.4 in) Tender wheels 1,105 mm (3 ft 7.5 in) Length: ​  • Over beams 16,978 mm (55 ft 8.4 in) 1913-1914: 16,951 mm (55 ft 7.4 in) Height 4,365 mm (14 ft 3.9 in) Loco weight 52.2 t (57.5 short tons; 51.4 long tons) Tender weight 39.2 t (43.2 short tons; 38.6 long tons) Fuel type Coal Fuel capacity 4 t (4.4 short tons; 3.9 long tons) Water cap. 17 m3 (3,700 imp gal) Firebox: ​  • Grate area 2.04 m2 (22.0 sq ft) Boiler pressure 10.5 bar (152 psi) superheated Heating surface: ​  • Firebox 10 m2 (110 sq ft)  • Tubes 71 m2 (760 sq ft) Superheater: ​  • Heating area 23 m2 (250 sq ft) Cylinders 2 Cylinder size 500 mm × 660 mm (20 in × 26 in) Valve gear Stephenson
Performance figures Maximum speed 100 km/h (62 mph) Tractive effort 59.23 kN (13,320 lbf)
Career Operators SS, NS Power class HSM: PV1, NS: PO1 Numbers HSM: 421-460, NS: 1901-1940 Withdrawn 1946-1948 Disposition All scrapped

The NS 1900 was a series of express train steam locomotives of the Dutch Railways (NS) and its predecessor Hollandsche IJzeren Spoorweg-Maatschappij (HSM).^[1]

After the first tank locomotives 771-772 (NS 5700) with superheater, the HSM ordered other locomotives with a superheater. Like the 771–772, these were built by Werkspoor in 1907. The HSM gave them numbers 421–425. In a way, these locomotives can be regarded as a further development of the 350-408 (NS 1600) with a superheater. After good experiences, including a coal saving of 15 to 17%, another order was places for a further 34 locomotives which were between 1908 and 1913.^[2]

When the locomotives and rolling stock fleets of the HSM and the Maatschappij tot Exploitatie van Staatsspoorwegen was merged in 1921, the locomotives of this series were given the NS numbers 1901–1940. During the Second World War, a number of locomotives were taken eastward, No's 1908, 1934, 1935 and 1937 never returned and were reported missing. The rest were disposed of between 1946 and 1948. No locomotive has been preserved.

• R.C. Statius Muller, A.J. Veenendaal jr., H. Waldorp: De Nederlandse stoomlocomotieven. Uitg. De Alk, Alkmaar, 2005. ISBN 90-6013-262-9.
• J. van der Meer: De Hollandsche IJzeren Spoorweg-Maatschappij. Uitg. Uquilair, 2009, ISBN 978-90-71513-68-8.
• J.J. Karskens: De Locomotieven van de Hollandsche IJzeren Spoorweg Maatschappij. Uitg. J.H. Gottmer, Haarlem - Antwerpen, 1947.
• M.A. Asselberghs: Nederlands Spoorwegmuseum. Een wandeling langs de verzameling. Uitg. Nederlands Spoorwegmuseum, Utrecht, 1987.