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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV><FONT face=Arial size=2>EdK</FONT> </DIV>
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