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 Middle Run Media | |
|---|---|
| Class | 685 |
| Locobase ID | 7509 |
| Railroad | Dutch State |
| Country | Netherlands |
| Whyte | 4-6-0 |
| Number in Class | 8 |
| Road Numbers | 685-692 |
| Gauge | Std |
| Number Built | |
| Builder | Beyer, Peacock |
| Year | 1910 |
| Valve Gear | Walschaert |
| 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 / 1170 |
| 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 Volume | 131.33 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5169 |
| Same as above plus superheater percentage | 6151 |
| Same as above but substitute firebox area for grate area | 32,931 |
| Power L1 | 9576 |
| Power MT | 599.54 |