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Chapelon's "enhanced" 3500 & 4500 P.O. Pacifics; 3800 & 4800 series (later S.N.C.F. 4 - 231 G & A). History - Technical data
Briefly, these units are big or small wheels Pacifics of the P.O.
improved at the lowest possible cost. Various transformations have been
applied on small batches of locomotives, such as an enlarged piping for
H.P. cylinders feeding on some units, Willoteaux's piston valves on the
L.P. or ordinary piston valve with increased stroke, new larger regulators,
A.C.F.I. feed water heaters on some units, .. resulting in about 4 or 5
different variant.
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