The two German Class 04
steam locomotive
A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...
s were experimental engines with the
Deutsche Reichsbahn, that were derived from the
Class 03 standard locomotives (''
Einheitsloks'').
History
In 1932, the Deutsche Reichsbahn tried to raise
boiler overpressure
Overpressure (or blast overpressure) is the pressure caused by a shock wave over and above normal atmospheric pressure. The shock wave may be caused by sonic boom or by explosion, and the resulting overpressure receives particular attention when m ...
s from by using high-tensile
steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
. These engines, built by the firm of
Krupp
The Krupp family (see pronunciation), a prominent 400-year-old German dynasty from Essen, is notable for its production of steel, artillery, ammunition and other armaments. The family business, known as Friedrich Krupp AG (Friedrich Krup ...
, were initially tested at the
Grunewald Locomotive Testing Office. With a specific steam consumption value of 5.2 kg/PSh with respect to their indicated output, the locomotives clearly undercut the very low steam consumption value of the Class 03 by over 1 kg/PSh. The coal consumption based on the effective power at the coupling hook, was 0.96 kg/PSh compared with 1.13 kg/PSh on the 03.
The medium-pressure boilers did not prove to be stable, and after a short time damage occurred to the
firebox. Since the
locomotive
A locomotive or engine is a rail transport vehicle that provides the Power (physics), motive power for a train. If a locomotive is capable of carrying a payload, it is usually rather referred to as a multiple unit, Motor coach (rail), motor ...
s did not meet expectations even after modifications and repairs, the permissible boiler overpressure was finally reduced to 20 atmospheres in 1935 and they were added to the operating portfolio with the company numbers 02 101 and 02 102. They were then intended to be used in regular train service from the Hamburg-Altona depot, but since they had no experience with four-cylinder compound locomotives there, they were handed over to the
Hof depot in 1936. Due to a lack of water, the
boiler of 02 101 exploded on 3 April 1939,
whereupon both engines were decommissioned and were scrapped in 1940.
The engines were equipped with a 2'2' T 32 standard
tender
Tender may refer to:
Entertainment Film
* ''Illegal Tender'' (2007), a film directed by Franc. Reyes
* ''Tender'' (2012), a short film by Liz Tomkins
* ''Tender'' (2019), a short film by Darryl Jones and Anthony Lucido
* ''Tender'' (2019), a sh ...
.
See also
*
List of DRG locomotives and railcars
*
List of boiler explosions
References
*
{{DRG locomotives
04
4-6-2 locomotives
04
Krupp locomotives
Railway locomotives introduced in 1932
Standard gauge locomotives of Germany
2′C1′ h4v locomotives
Passenger locomotives