Saxon VIII V 1
German Reichsbahn classes 1371 and 1315
The Saxon state railway classified locomotives in class VIII, which had the wheel arrangement 4-4-0 and pulled a large portion of the express trains. The first model in the series was designated VIII 1 and had been in use in small numbers since 1870. The designation of the VIII V 1, which had been built since 1896 based on the Prussian S 3, indicated the use of a compound engine. Together with its two sister models, which were introduced around the same time, it quickly ousted its predecessor from the high-value services.
With its 1,885 mm driver diameter, it reached a top speed of not very outstanding 85 km/h, but at that time this was sufficient for express trains. In the years 1896 and 1897, ten examples each with cylinder diameters of 460 and 680 mm and with 500 and 700 mm were built. The last models built reached 100 km/h with cylinder diameters of 480 and 630 mm, as well as a boiler pressure increased to 13 bars.
Despite the good efficiency of the compound engine, a lack of power became apparent, especially after the introduction of faster six-coupled express locomotives, which soon made the VIII V 1 no longer the first choice. The low adhesive weight of just over 30 tonnes was also a disadvantage in mountainous areas. The Reichsbahn took over 23 of the 32 engines built and retired all of them by 1932. They were classified as classes 1315 and 1371.
Technical data
General
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Built | 1896-1897 | 1900 | |
| Manufacturers | Hartmann | ||
| Wheel arrangement | 4-4-0 (American) | ||
| Gauge | 1,435 mm (Standard gauge) | ||
Dimensions and weights
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Length | 16.79 m | ||
| Wheelbase | 6.80 m | ||
| Empty mass | 49 t | ||
| Service mass | 54.5 t | ||
| Adhesion mass | 32 t | ||
| Rigid wheelbase | 2.40 m | ||
| Axle load | 16 t | ||
| Water capacity | 12,000 l | 15,000 l | 21,000 l |
| Fuel capacity | 4 t (coal) | 5 t (coal) | 7 t (coal) |
Boiler
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Grate area | 2.3 m² | ||
| Firebox surface | 11.07 m² | ||
| Tube heating surface | 117.86 m² | ||
| Evaporative heating surface | 128.93 m² | ||
| Total heating surface | 128.9 m² | ||
Power plant
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Driver diameter | 1,885 mm | ||
| Boiler pressure | 12 bar | 13 bar | |
| Expansion type | compound | ||
| Cylinders | two, HP: 460 x 630 mm and LP: 680 x 630 mm | two, HP: 500 x 630 mm and LP: 700 x 630 mm | two, HP: 480 x 630 mm and LP: 700 x 630 mm |
Power
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Power source | steam | ||
| Estimated power | 525 kW (714 PS) | ||
| Top speed | 85 km/h | 100 km/h | |
| Starting effort | 49.5 kN | 56.4 kN | 57.9 kN |
| Starting effort simple | 59.4 kN | 67.7 kN | 69.5 kN |
Calculated values
| Property | 121-130 | 131-140 | 141-152 |
|---|---|---|---|
| Factor of adhesion | 1 : 6.34 | 1 : 5.56 | 1 : 5.42 |
| Optimal speed | 64 km/h | 56 km/h | 55 km/h |
| Power-to-weight ratio | 9.6 kW/t | ||
| Heating Surface Equivalent | 184.3 m² | ||
| Cylinder volume/HSE | 1 : 1,188.94 | 1 : 1,329.10 | 1 : 1,276.47 |
| Adhesive weight/Total | 1 : 1.70 | ||
| Tractive force/Heating surface | 1 : 8.02 | 1 : 9.14 | 1 : 9.38 |
| Grate area/Heating surface | 1 : 56.06 | ||
| Firebox/Tube surface | 1 : 10.65 | ||