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Re: [BRHSlist] Light Mikes

To: BRHSlist@yahoogroups.com
Subject: Re: [BRHSlist] Light Mikes
From: "zephyr9903" <zephyr9903@iowatelecom.net>
Date: Mon, 18 Aug 2003 06:46:01 -0600
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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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