At the beginning of the twentieth century, the NFLS ordered ten locomotives for local trains on the Leeuwarden - Stiens - Metslawier, Stiens - Harlingen, and Tzummarum - Franeker Halte lines from the Hohenzollern factory in Düsseldorf-Grafenberg. They were tank engines with the 1'B1' wheel arrangement, the leading axle of which was designed as an Adams axle. The first six locomotives entered service in 1901, followed by the other four in 1902. As of December 1, 1905, the operation of these lines was taken over by the HSM, whereby the locomotives and rolling stock was also taken over. The HSM renumbered the ten locomotives in the series 1051–1060.
When the locomotives and rolling stock fleet of the HSM and the SS was merged in 1921, the locomotives of this series were given the NS numbers 7101–7110. No. 7110 was withdrawn from service in 1925, followed by No. 7107 in 1939. At the end of World War II, Nos. 7104, 7105 and 7108 were taken to Germany, of which only No. 7108 was returned to service. Of the locomotives that remained in the Netherlands, Nos. 7102 and 7109 were not repaired from war damage. The locomotives that did return to service after the war were withdrawn in 1949.
A few years after the delivery of the first batch of ten tank locomotives, the SS ordered about fifteen similar locomotives from the same factory. The first seven were put into service in 1907 as SS 531–537. The SS 538-545 followed in 1908. The SS used these locomotives on light passenger trains on local railway lines. When the locomotives and rolling stock fleet of the HSM and the SS was merged in 1921, these locomotives were given the NS numbers 7111-7125 after the original ten HSM locomotives. No. 7114 was withdrawn from service in 1925, followed by No. 7116 in 1936.
During the German invasion, No. 7124 was run into the Potmarge near Leeuwarden to stop the advance of the enemy troops. After the locomotive was salvaged, it was not repaired. At the end of the war, Nos. 7117, 7118, 7120, 7122 and 7123 were taken to Germany. The first four returned damaged after the war, but were never repaired. No. 7123 did not return at all and was scrapped at Hagenow in 1951. Of the locomotives left behind in the Netherlands, Nos. 7113 and 7119 were not repaired from war damage. The remaining locomotives were withdrawn from service in 1947 and 1948.
Factorynumber
Date built
NFLS number
HSM number
SS number
NS number
Withdrawn
Notes
1376
1901
1
1051
7101
1949
1377
1901
2
1052
7102
1947
Withdrawn and scrapped due to war damage.
1378
1901
3
1053
7103
1949
1379
1901
4
1054
7104
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
1380
1901
5
1055
7105
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
1381
1901
6
1056
7106
1949
1533
1902
7
1057
7107
1939
1534
1902
8
1058
7108
1949
Taken to Germany, after the locomotive returned it was repaired.
1539
1902
9
1059
7109
1947
Withdrawn and scrapped due to war damage.
1540
1902
10
1060
7110
1925
2139
1907
531
7111
1947
2140
1907
532
7112
1947
2141
1907
533
7113
1945
Withdrawn and scrapped due to war damage.
2142
1907
534
7114
1925
2143
1907
535
7115
1948
2144
1907
536
7116
1936
2145
1907
537
7117
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
2120
1908
538
7118
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
2121
1908
539
7119
1945
Withdrawn and scrapped due to war damage.
2122
1908
540
7120
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
2123
1908
541
7121
1947
2124
1908
542
7122
1947
Taken to Germany, after the locomotive returned it was scrapped due to war damage.
2125
1908
543
7123
1948
Taken to Germany. Scrapped in Hagenow in 1951.
2126
1908
544
7124
1940
On May 10, 1940, in Leeuwarden, run into the Potmarge to block the track for the advancing German troops.