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| 231 D series, 4 cyl. compound. Modified according to Chapelon's theories and with its participation, they used Lentz-Dabeg valve gear on L.P. cylinders (i.e. where minimum steam throttling is imperative for a good efficiency). | 231 DD series (S.N.C.F. 3-231G). They are very close replicas of P.O.'s Chapelon PACIFICS, as they used identical major dimensions (the boiler is quite different however) and are fitted with Lentz-Dabeg on both H.P. & L.P. cylinders. Chapelon designed steam circuit and cams. |
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231 W series (S.N.C.F. 3 - 231 F). Use Willoteaux piston valves on the L.P. group. |
