The reference for locomotives and railcars


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Emperor Ferdinand Northern Railway series IVa, later Ia
später umgebaut zu class IIb 1 (Imperial-Royal State Railways class 407)
Austria-Hungary | 1862 | 5 produced
„Rakete<sup>II</sup>” in its original state
„RaketeII” in its original state

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.

“Komet<sup>II</sup>” with driver's cab
“KometII” with driver's cab

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.

Variantas builtrebuilt IIb 1
ManufacturerWiener Neustadt
Axle config2-2-2 (Jenny Lind) 2-4-0 (Porter) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco25 ft 1 1/4 in27 ft 9 9/16 in
Wheelbase15 ft 0 1/2 in
Fixed wheelbase15 ft 0 1/2 in
Empty weight61,729 lbs72,752 lbs
Service weight69,446 lbs81,571 lbs
Adhesive weight55,116 lbs
Total weight122,356 lbs134,482 lbs
Axle load27,558 lbs
Water capacity2,536 us gal
Fuel capacity13,228 lbs (coal)
Power sourcesteam
Estimated power302 hp (225 kW)402 hp (300 kW)
Optimal speed31 mph27 mph
Starting effort6,200 lbf9,533 lbf
Power Plant
Driver diameter77.8 in
Boiler pressure94 psi145 psi
Expansion typesimple
Cylinderstwo, 15 9/16 x 24 7/8 in
Grate area12.9 sq ft17 sq ft
Firebox area96.9 sq ft73.2 sq ft
Tube heating area1,161.4 sq ft1,099 sq ft
Evaporative heating area1,258.3 sq ft1,172.2 sq ft
Total heating area1,258.3 sq ft1,172.2 sq ft
Calculated Values
steam locomotive
last changed: 03/2024

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