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Informationen zum Vorbild
Güterzug-Dampflokomotive BR 50.40
Nach intensiven Versuchen mit den beiden Franco-Crosti Lo-
komotiven der Baureihe 42.90 entschied sich die Deutsche
Bundesbahn, mehrere Loks der BR 50 dementsprechend umzu-
bauen. Bei einem Franco-Crosti Kessel handelt es sich um ei-
nen herkömmlichen Lok-Kessel mit nachgeschaltetem zweitem
Kessel. Dieser erwärmt das Speisewasser mit Hilfe der vorbei-
strömenden Rauchgase. Dieser zweite Kessel wird daher Ab-
gasvorwämer genannt. Die italienischen Konstrukteure Franco
und Crosti bauten bereits in den 1930er-Jahren die ersten Ver-
suchsmaschinen mit dieser Technik. Die Kohleersparnis durch
den verbesserten Wirkungsgrad betrug etwa 20 %. Auf einer
Seite des Kessels ragt der flache Betriebsschornstein heraus,
was ein recht markantes Erscheinungsbild ergibt. Der normale
Schornstein dient während des Betriebes nicht mehr zum Ablei-
ten der Rauchgase, sondern wird dazu nur noch beim Anheizen
benötigt. Trotz des gesteigerten Wirkungsgrades ergaben sich
relativ hohe Betriebskosten, da die Vorwärmerkessel sehr kor-
rosionsanfällig waren.
Insgesamt 31 Lokomotiven wurden von Henschel 1954 bzw. 1958
an die Deutsche Bundesbahn geliefert und als Baureihe 50.40
eingereiht. Die zweizylindrigen, 90,6 t schweren Lokomotiven
hatten vorwärts wie rückwärts eine Höchstgeschwindigkeit von
80 km/h und eine induzierte Leistung von 1.540 PSi. Sie waren im
Münsterland und im Rheinland im Güterzugdienst eingesetzt bis
sie 1967 ausgemustert und verschrottet wurden.
Information about the Prototype
German Federal Railroad class 50.40
After intensive experiments with the two class 42.90 Franco-
Crosti locomotives, the German Federal Railroad decided to
convert several class 50 locomotives in the same manner. A
Franco Crosti boiler is a conventional locomotive tank with a
second boiler connected in the steam lines. It heats feed water
with the assistance of smoke exhaust gases passing over the
water. This second boiler is therefore called an exhaust gas
pre-heater. The Italian designers Franco and Crosti built their
first test units with this technology as early as the Thirties. The
savings in coal were approximately 20 % with the improved ef-
ficiency. The flat smokestack for operation projects from one
side of the boiler, which results in a rather striking appearance.
The standard smokestack no longer serves to discharge smoke
exhaust gases during operation, but is only required for firing
up the locomotive. Relatively high operating costs resulted de-
spite the increased efficiency, since the pre-heater boiler was
easily subject to corrosion.
A total of 31 locomotives were delivered to the German Federal
Railroad by Henschel in 1954 and 1958, and were designated
as the class 50.40. These two-cylinder, 90.6 metric tons heavy
locomotives had a maximum speed of 80 km/h / 50 mph in both
directions and an indexed performance of 1,540 pounds per
square inch. They were used in the Münsterland area and in
the Rhine area in freight train service until they were retired in
1967 and then scrapped.
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