StaatsSpoorwegen 2-4-2 Locomotives in Netherlands


Class Details by Steve Llanso of Sweat House Media

Class 531/7111 (Locobase 20088)

Data from Bijlage 19, "Locomotieven NFLS 1-10 en 531-545", downoaded from [link], last accessed 9 August 2016. Works numbers were 1376-1381 in 1901 and 1533-1534, 1539-1540 in 1902.

Five years after the NFLS bought ten double-ended tanks for local traffic (Locobase 20087), the SS, which now operated those locomotives, went back to their German builder for very similar engines that had more water capacity because of added tankage below the coal bunker. Like the first set, the maximum speed was 80 kph (50 mph).

They received NS numbers 7111-7125 in 1921.

7114 was withdrawn in 1925 and 7116 left service in 1936. 7124 was used to block German troop movements during the opening day of the German invasion of the Netherlands on 10 May 1940 and was destroyed. 7113 was damaged late in World War II and did not return to service.

7117, 7118, 7120, 7122 and 7123 all were taken into the German DRG after the Netherlands surrendered. Because of damage incurred in that service, none was returned to Dutch service. All but 7123 were scrapped in 1947; 7123 was broken up in Hagenow in 1951. The rest all retired in1948.

Principal Dimensions by Steve Llanso of Middle Run Media
Class531/7111
Locobase ID20088
RailroadStaatsSpoorwegen (SS)
CountryNetherlands
Whyte2-4-2T
Number in Class15
Road Numbers531-545/7111-7125
GaugeStd
Number Built15
BuilderHohenzollern
Year1907
Valve GearAlco-Richmond
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.56 / 2
Engine Wheelbase (ft / m)19.69 / 6
Ratio of driving wheelbase to overall engine wheelbase 0.33
Overall Wheelbase (engine & tender) (ft / m)19.69 / 6
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)54,983 / 24,940
Engine Weight (lbs / kg)108,026 / 49,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1584 / 6
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.20 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)46 / 23
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60.60 / 1539
Boiler Pressure (psi / kPa)171.10 / 1180
High Pressure Cylinders (dia x stroke) (in / mm)14.96" x 22.05" / 380x560
Tractive Effort (lbs / kg)11,843 / 5371.90
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.64
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)78.04 / 7.25
Grate Area (sq ft / m2)15.28 / 1.42
Evaporative Heating Surface (sq ft / m2)939 / 87.24
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)939 / 87.24
Evaporative Heating Surface/Cylinder Volume209.32
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2614
Same as above plus superheater percentage2614
Same as above but substitute firebox area for grate area13,353
Power L15121
Power MT410.67

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