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Empress Elisabeth Railway series A III
Imperial-Royal State Railways class 7
Austria-Hungary | 1879 | 8 produced
No. 46 “Fünfhaus” before being redesignated by the kkStB
No. 46 “Fünfhaus” before being redesignated by the kkStB

In the years 1879 and 1880, the Kaiserin-Elisabeth-Bahn procured a total of eight more 2-4-0 express locomotives from the workshops of the state railway company. The requirements specified were that 100 tonnes should be towed at 55 km/h or 200 tonnes at 27.5 km/h on a gradient of one percent. In order to achieve the necessary train loads on the curve radii from 280 meters, a great deal of development effort was put into the locomotives. This also included the Haswell corrugated iron firebox, which was only used in the 1870s and was not able to establish itself beyond that.

The biggest difference to the existing series I and II was that the diameter of the coupled wheels was increased from 1,580 to 1,900 mm. Although the top speed was only increased from 70 to 80 km/h, this improved smooth running at higher speeds and reduced consumption and wear. The reduced traction due to the significantly larger wheels was compensated for by a higher boiler pressure of ten bars and a slightly larger cylinder diameter. In addition, it was about seven tonnes heavier than the KEB II and thus had a larger adhesive weight

Schematic drawing with dimensions
Schematic drawing with dimensions
Die Lokomotive, June 1936

All in all, the A III was the most powerful of all Austrian 2-4-0 locomotives and also outperformed many 4-4-0 locomotives well into the 1890s. They were taken over by the kkStB in 1883 and initially referred to as A III. Later they became class 7 and got the numbers 7.01 to 7.08. The BBÖ also took over six more after the First World War and retired them between 1922 and 1929.

General
Built1879-1880
ManufacturerStEG
Axle config2-4-0 (Porter) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length29 ft 2 5/8 in
Wheelbase14 ft 5 1/4 in
Fixed wheelbase7 ft 8 1/2 in
Empty weight82,232 lbs
Service weight92,594 lbs
Adhesive weight62,170 lbs
Axle load31,306 lbs
Water capacity2,774 us gal
Fuel capacity14,330 lbs (coal)
Power
Power sourcesteam
Estimated power570 hp (425 kW)
Optimal speed30 mph
Top speed50 mph
Starting effort12,024 lbf
Power Plant
Driver diameter74.8 in
Boiler pressure145 psi
Expansion typesimple
Cylinderstwo, 17 1/8 x 24 7/8 in
Boiler
Grate area26 sq ft
Firebox area96.9 sq ft
Tube heating area1,116.2 sq ft
Evaporative heating area1,213.1 sq ft
Total heating area1,213.1 sq ft
Calculated Values
steam locomotive
express
last changed: 01/2022
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