Baden VIII c
When a powerful freight locomotive was being searched that could still negotiate curves on the Black Forest Railway, Grafenstaden had the class VIII c designed after the Mallet design. Only two pre-production locomotives were manufactured there, the production of all others was taken over by MBG Karlsruhe and Maschinenfabrik Esslingen.
Although the ability to negotiate curves was good, the rear axles, which were fixed in the frame, could hardly offer sufficient directional stability for the front bogie that could be shifted laterally due to their short wheel base. In addition to the tendency to slip, which was already a problem in Mallet locomotives, the running smoothness was insufficient. Furthermore, due to the special construction of the running gear, the boiler was somewhat smaller than in comparable standard-design locomotives, which meant that the locomotives did not achieve the power of the classes VIII a and VIII b despite their greater weight.
Nevertheless, series production was ordered, and so twelve locomotives were built in Karlsruhe in 1895 and another 18 in Esslingen in 1899/1900. After the war, eight came to France and one to Belgium. The locomotives remaining in Germany were retired by 1925, which is why they were not renumbered to class 5561.
Technical data
General
| Property | pilot series | series |
|---|---|---|
| Built | 1893 | 1895, 1899-19000 |
| Manufacturers | Grafenstaden | MBG Karlsruhe, Esslingen |
| Wheel arrangement | 0-4-4-0 | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | pilot series | series |
|---|---|---|
| Length | 16.76 m | |
| Wheelbase | 5.80 m | |
| Empty mass | 51.6 t | |
| Service mass | 57.8 t | |
| Adhesion mass | 57.8 t | |
| Total mass | 92.1 t | |
| Rigid wheelbase | 1.75 m | |
| Axle load | 14.5 t | |
| Water capacity | 13,500 l | 14,000 l |
| Fuel capacity | 4 t (coal) | |
Boiler
| Property | pilot series | series |
|---|---|---|
| Grate area | 1.96 m² | 1.93 m² |
| Firebox surface | 10.38 m² | 9.66 m² |
| Tube heating surface | 125.23 m² | |
| Evaporative heating surface | 135.61 m² | 134.89 m² |
| Total heating surface | 135.6 m² | 134.9 m² |
Power plant
| Property | pilot series | series |
|---|---|---|
| Driver diameter | 1,260 mm | |
| Boiler pressure | 12 bar | 13 bar |
| Expansion type | compound | |
| Cylinders | two, HP: 390 x 600 mm and LP: 600 x 600 mm | |
Power
| Property | pilot series | series |
|---|---|---|
| Power source | steam | |
| Estimated power | 500 kW (680 PS) | 525 kW (714 PS) |
| Top speed | 45 km/h | |
| Starting effort | 51.9 kN | 56.3 kN |
| Starting effort simple | 62.3 kN | 67.5 kN |
Calculated values
| Property | pilot series | series |
|---|---|---|
| Factor of adhesion | 1 : 10.92 | 1 : 10.08 |
| Optimal speed | 60 km/h | 56 km/h |
| Power-to-weight ratio | 8.7 kW/t | 9.1 kW/t |
| Heating Surface Equivalent | 187.5 m² | 183.2 m² |
| Cylinder volume/HSE | 1 : 834.61 | 1 : 854.30 |
| Adhesive weight/Total | 1 : 1.00 | |
| Tractive force/Heating surface | 1 : 8.00 | 1 : 8.71 |
| Grate area/Heating surface | 1 : 69.19 | 1 : 69.89 |
| Firebox/Tube surface | 1 : 12.06 | 1 : 12.96 |