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The reference for locomotives and railcars

Baden VIII a

Germany 1875 12 produced
Hanomag works photo PD

When the six-coupled locomotives on the Black Forest and the Odenwald lines with gradients of 1.25 percent became too weak, Hanomag delivered twelve eight-coupled locomotives in 1875. The axles were put as closely together as possible, but the desired rigid wheelbase of 2.5 metres needed for the sharp curves could not be realized. So the first and last driving axles were built with 12.5 mm of lateral play, what had a negative impact on the running characteristics. Later, the Baden State Railway bought type VIII c Mallet locomotives for mountain lines with sharp curves. So the number of the VIII a remained at twelve, which were withdrawn by 1923.

Technical data

General

Built
1875
Manufacturers
Hanomag
Wheel arrangement
0-8-0 (Eight-coupled)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
15.68 m
Wheelbase
2.92 m
Total wheelbase
10.16 m
Empty mass
45.6 t
Service mass
52.4 t
Adhesion mass
52.4 t
Axle load
12.9 t
Water capacity
11,500 l
Fuel capacity
4 t (coal)

Boiler

Grate area
2 m²
Firebox surface
8.2 m²
Tube heating surface
173.3 m²
Evaporative heating surface
181.5 m²
Total heating surface
181.5 m²

Power plant

Driver diameter
1,220 mm
Boiler pressure
9 bar
Expansion type
simple expansion
Cylinders
two, 530 x 635 mm

Power

Power source
steam
Estimated power
450 kW (612 PS)
Top speed
45 km/h
Starting effort
111.8 kN

Calculated values

Factor of adhesion
1 : 4.60
Optimal speed
24 km/h
Power-to-weight ratio
8.6 kW/t
Heating Surface Equivalent
222.5 m²
Cylinder volume/HSE
1 : 1,259.26
Adhesive weight/Total
1 : 1.00
Tractive force/Heating surface
1 : 12.87
Grate area/Heating surface
1 : 90.75
Firebox/Tube surface
1 : 21.13
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