On Mon, 18 Aug 2003 07:22:07 -0500, sdoyle19 wrote
> Wondered when the Q first starting ordering or building "Heavy
> Mikes" and what obvious cosmetic appearances distinguished them
> from the "Light Mikes". Is there a numbering series for Lights
> versus Heavies? Thanks, Steve
Not counting the USRA heavies (class O-4), the Q's light mikes were class O-1
and the improved O-1A; the heavies were the O-2 and O-3 classes. They were
most easily distinguished by a straight boiler top, all taper being at the
bottom in front of the firebox (boiler design was similar to S-3 Heavy
Pacific and M-1/M-2 2-10-2s)
They started building lights around 1910 (no longer have my rosters), heavies
3-4 years later. The heavies were not that successful - slow and under-
steamed. The lights were so good that they were still building new O-1As in
the '20s. . .
Marshall Thayer
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