Swedish State Railways B (II)
Sweden 1909 99 produced
Under the impression of the Prussian P 8, the class A (II) Atlantic was developed into the B (II) with the wheel arrangement 4-6-0. The SJ had 96 locomotives built between 1909 and 1919. With the advancing electrification in the 1930s, some locomotives were sold to private railways, which later came back to the SJ after nationalization. The SVB (Stockholm-Västerås-Bergslagens Järnvägar) even had three more locomotives built in 1943 and 1944. The locomotives were retired by 1972 and kept as a strategic reserve until the 1990s. For this reason, many are still preserved today.
Technical data
General
| Property | standard | type A tender |
|---|---|---|
| Built | 1909-1919, 1943-1944 | |
| Manufacturers | NoHAB, Motala Verkstad, VoM | NoHAB, ASJ |
| Wheel arrangement | 4-6-0 (Ten-wheeler) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | standard | type A tender |
|---|---|---|
| Length | 19.49 m | |
| Wheelbase | 11.38 m | |
| Empty mass | 63.7 t | |
| Service mass | 70.2 t | |
| Adhesion mass | 47.7 t | |
| Total mass | 103 t | 116.8 t |
| Rigid wheelbase | 4.25 m | |
| Axle load | 15.9 t | |
| Water capacity | 14,000 l | 20,000 l |
| Fuel capacity | 5.2 t (coal) | 6 t (coal) |
Boiler
| Property | standard | type A tender |
|---|---|---|
| Grate area | 2.6 m² | |
| Firebox surface | 12.7 m² | |
| Tube heating surface | 158.2 m² | |
| Evaporative heating surface | 170.9 m² | |
| Superheater surface | 50.7 m² | |
| Total heating surface | 221.6 m² | |
Power plant
| Property | standard | type A tender |
|---|---|---|
| Driver diameter | 1,750 mm | |
| Boiler pressure | 11.8 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 590 x 620 mm | |
Power
| Property | standard | type A tender |
|---|---|---|
| Power source | steam | |
| Estimated power | 825 kW (1,122 PS) | |
| Top speed | 90 km/h | |
| Starting effort | 123.7 kN | |
Calculated values
| Property | standard | type A tender |
|---|---|---|
| Factor of adhesion | 1 : 3.78 | |
| Optimal speed | 40 km/h | |
| Power-to-weight ratio | 11.8 kW/t | |
| Heating Surface Equivalent | 335.8 m² | |
| Cylinder volume/HSE | 1 : 1,009.57 | |
| Adhesive weight/Total | 1 : 1.47 | |
| Tractive force/Heating surface | 1 : 11.66 | |
| Grate area/Heating surface | 1 : 85.23 | |
| Firebox/Tube surface | 1 : 12.46 | |
| Total/Superheater | 1 : 3.37 | |
