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Staatsspoorwegen series 685
The Staatsspoorwegen series 685, better known as NS series 3700, was a 4-6-0 express locomotive introduced in 1910. When the SS needed a more powerful replacement for their 4-4-0 locomotives, the 4-4-2 of series 995 (...
General
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Built | 1910-1928 |
| Manufacturers | Beyer, Peacock & Co., Werkspoor, Henschel, Hanomag, BMAG |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Length | 18.48 m |
| Wheelbase | 8.65 m |
| Rigid wheelbase | 4.20 m |
| Total wheelbase | 15.28 m |
| Service weight | 75 t |
| Adhesive weight | 49.9 t |
| Axle load | 16.8 t |
| Total weight | 115 t |
| Water capacity | 18,000 l |
| Fuel capacity | 6 t (coal) |
Boiler
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Grate area | 2.84 m² |
| Firebox surface | 15.44 m² |
| Tube heating surface | 144.89 m² |
| Evaporative heating surface | 160.33 m² |
| Superheater surface | 41 m² |
| Total heating surface | 201.3 m² |
Power plant
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Driver diameter | 1,850 mm |
| Boiler pressure | 12 bar |
| Expansion type | simple expansion |
| Cylinders | four, 400 x 660 mm |
Power
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Power source | steam |
| Indicated power | 995 kW (1,353 PS) |
| Top speed | 110 km/h |
| Starting effort | 116.4 kN |
Calculated values
| Property | Staatsspoorwegen series 685 three-axle tender |
|---|---|
| Factor of adhesion | 1 : 4.20 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 13.3 kW/t |
| Heating Surface Equivalent | 319.5 m² |
| Cylinder volume/HSE | 1 : 1,038.25 |
| Adhesive weight/Total | 1 : 1.50 |
| Tractive force/Heating surface | 1 : 12.08 |
| Grate area/Heating surface | 1 : 70.89 |
| Firebox/Tube surface | 1 : 9.38 |
| Total/Superheater | 1 : 3.91 |
