The introduction of super heated
steam was the last essential Improvement to Stephenson design locomotives.
Reason enough for the DRG to pursue a totally new concept in Germany;
the building of a turbine locomotive. The contract was awarded in 1924
to Maffie, and the T18 1002 was finished in 1926 as a pure steam turbine
locomotive. The boiler for the locomotive was shorter in length due
to the higher pressure and the lower rate steam consumption, and was
designed for an operating pressure of 22 bar (319 pounds per square
inch) The forward and reverse direction turbines were arranged together
in a housing. Three wheel sets were powered through side rods from the
jackshaft mounted between the wheel sets for the trucks. In a departure
from the specified dimensions for standard design locomotives, the wheels
for the trailing truck wheel set on this locomotive exhibit the Bavarian
characteristic of being only 1,206 mm (47-1/2") in diameter as
measured from the wheel tread. The condensers were switched in parallel
and were mounted beneath the running board on both sides; the recooling
process took place in the cooling tender. After they were finished,
this lococmotive was tested by the Grunewald testing facility on a main
line and on a test bed. It was discovered during these tests that there
was too high a level of power lost because of the empty reverse direction
turbine that was rotating with the rest of the running gear. A new main
turbine and another reverse gear box turbine switching work were installed.
After all of the deficiencies were corrected the T 18 1002 was assigned
to the Munich main station and it was used in service until 1943 on
the routes Munich - Würzburg and Munich - Lindau in express and
fast train service.
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