NW-Mailing-List Digest, Vol 46, Issue 18

[NW Mailing List]

M-2s were not reclassed when superheaters were installed.  They remained in class M-2.  The eleven Roanoke-built Ms were in three classes - M-2a, M-2b and M-2c.  All differed from the M-2s in having Baker instead of Walschaert valve gear.  IIRC, the M-2as had stokers, the M-2bs had Hobart-Alfree cylinders and stokers, and the M-2cs had superheaters and stokers.  In time, the M-2as got superheaters and were reclassed M-2c.  The M-2bs got conventional cylinders and superheaters and were reclassed M-2c.  Bud Jeffries has better information about these mods than I do, and can probably even give the individual engine numbers.

EdK 
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