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

NW Mailing List nw-mailing-list at nwhs.org
Tue Aug 18 22:23:58 EDT 2009


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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