FRENCH COMPOUND LOCOMOTIVES' HOMEPAGE
3 - 242 A 1 S.N.C.F.'s, 4-8-4 prototype:
History - Technical data
The locomotive having supplied some basic components of 242
A1 (wheels, axles, parts of cab, tender). As shown, it was a very disapointing
single expansion three cylinders engine featuring a Renaud valve gear.
The goal of the designer of this valve gear was to reach, using S.E. locomotives,
expansion values as high as the ones attained with compound engines but
of course the system has never worked properly, all the engines tested
with this system having an efficiency lower than any ordinary single expansion
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