Dutch State 4-6-0 Locomotives in Netherlands

Class Details by Steve Llanso of Sweat House Media

Class 685 (Locobase 7509)

Data from 1946 Beyer, Peacock catalogue hosted on Martyn Bane's website at [] (accessed 21 May 2006). Works numbers were 5370-5375 (Batch #069) in 1910.

Beyer, Peacock and the Dutch State Railways supported each other for decades during which the builder appeared as the most significant foreign builder for the system. This batch began a series of Ten-wheeler deliveries over a four-year period that totalled 36 locomotives in four batches, all likely to have been to the same design. Fitted with a high-mounted Belpaire firebox topped by broad safety-valve stand, small dome over the first driven axle, and four valve-motions of which two were tucked away inside, this locomotive looked every bit of a passenger locomotive.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID7509
RailroadDutch State
Number in Class8
Road Numbers685-692
Number Built
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.78 / 4.20
Engine Wheelbase (ft / m)28.35 / 8.64
Ratio of driving wheelbase to overall engine wheelbase 0.49
Overall Wheelbase (engine & tender) (ft / m)50.10 / 15.27
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,572 / 16,135
Weight on Drivers (lbs / kg)105,639 / 47,917
Engine Weight (lbs / kg)139,552 / 63,300
Tender Loaded Weight (lbs / kg)97,665 / 44,300
Total Engine and Tender Weight (lbs / kg)237,217 / 107,600
Tender Water Capacity (gals / ML)4800 / 18.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 6.60 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72 / 1830
Boiler Pressure (psi / kPa)169.70 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)16.54" x 25.98" / 420x660 (4)
Tractive Effort (lbs / kg)28,478 / 12917.42
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.71
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)163.07 / 15.15
Grate Area (sq ft / m2)30.46 / 2.83
Evaporative Heating Surface (sq ft / m2)1697 / 157.70
Superheating Surface (sq ft / m2)396 / 36.80
Combined Heating Surface (sq ft / m2)2093 / 194.50
Evaporative Heating Surface/Cylinder Volume131.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5169
Same as above plus superheater percentage6151
Same as above but substitute firebox area for grate area32,931
Power L19576
Power MT599.54

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