Emperor Ferdinand Northern Railway IVa, later Ia
later rebuilt to IIb 1 and Imperial-Royal State Railways class 407
Austria-Hungary 1862 5 produced
In 1862, Sigl manufactured five 2-2-2 express locomotives for the KFNB. They were named “RaketeII”, “BlitzII”, “KometII”, “VestaII” and “NeptuneII”. They were initially classified as type IVa and renamed Ia in 1869. They were characterized by an outside frame and outside cylinders.
When they were used for conventional passenger trains after the economic downturn in 1873, the single driving axle proved to be an obstacle. In 1882 and 1883, all locomotives were rebuilt into the IIb 1, which now had the 2-4-0 wheel arrangement but the same driving wheel diameter. The “KometII” came to the kkStB in 1906 as class 407 and survived until 1913.
Technical data
General
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Built | 1862 | 1882-1883 |
| Manufacturers | Wiener Neustadt | |
| Wheel arrangement | 2-2-2 (Jenny Lind) | 2-4-0 (Porter) |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Length loco | 7.65 m | 8.47 m |
| Wheelbase | 4.58 m | |
| Empty mass | 28 t | 33 t |
| Service mass | 31.5 t | 37 t |
| Total mass | 55.5 t | 61 t |
| Rigid wheelbase | 4.58 m | |
| Water capacity | 9,600 l | |
| Fuel capacity | 6 t (coal) | |
| Adhesion mass | 25 t | |
| Axle load | 12.5 t | |
Boiler
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Grate area | 1.2 m² | 1.58 m² |
| Firebox surface | 9 m² | 6.8 m² |
| Tube heating surface | 107.9 m² | 102.1 m² |
| Evaporative heating surface | 116.9 m² | 108.9 m² |
| Total heating surface | 116.9 m² | 108.9 m² |
Power plant
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Driver diameter | 1,976 mm | |
| Boiler pressure | 6.5 bar | 10 bar |
| Expansion type | simple expansion | |
| Cylinders | two, 395 x 632 mm | |
Power
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Power source | steam | |
| Estimated power | 225 kW (306 PS) | 300 kW (408 PS) |
| Starting effort | 27.6 kN | 42.4 kN |
Calculated values
| Property | as built | rebuilt IIb 1 |
|---|---|---|
| Optimal speed | 50 km/h | 43 km/h |
| Power-to-weight ratio | 7.1 kW/t | 8.1 kW/t |
| Heating Surface Equivalent | 161.9 m² | 142.9 m² |
| Cylinder volume/HSE | 1 : 956.72 | 1 : 1,083.92 |
| Tractive force/Heating surface | 1 : 4.93 | 1 : 8.14 |
| Grate area/Heating surface | 1 : 97.42 | 1 : 68.92 |
| Firebox/Tube surface | 1 : 11.99 | 1 : 15.01 |
| Factor of adhesion | 1 : 5.78 | |
| Adhesive weight/Total | 1 : 1.48 |
