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M1sa vs. M1sb...?

This board is the place where questions and information specific to MODELING the Reading Company, its equipment and operations can be shared - questions like "What was the window arrangement of AF Tower in Alburtis?" and "What color paint do YOU use to paint the Reading's cream-and-brown buildings?" We also want to hear about YOUR Reading modeling projects!

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TOPIC: M1sa vs. M1sb...?

M1sa vs. M1sb...? 11 years 1 month ago #772

Wowak OFFLINE Engineer Posts: 101 Thank you received: 8	And here I thought it was just to ease maintenance. In any case the front pumps are butt-ugly, so I'll be modeling the earlier configuration. It does strike me as odd... when RDG put the drivers from the I10s that became T-1s under the I9sas, they called them I9scs... strange that there's not a class deliniation between M1sbs with two different driver sizes.
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M1sa vs. M1sb...? 11 years 1 month ago #812

WindsorSpring
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Engineer
Posts: 94
Thank you received: 8

Per Edward Wiswesser in Steam Locomotives of the Reading and P&R Railroads, p 164, some M-1sb Mikados had their smaller drivers exchanged for 61 1/2 inch drivers "...for speedier wartime freight hauls and troop trains...". It goes on to say "Engines 1747 through 1756, among others, were so modified."

"Appendix 9, Complete Chronological Roster" shows a 1928 - 1829 rebuild of 1747 through 1756 to M-1sa standards, but does not say whether the driver size was changed then (though I suppose M-1sa means 61 1/2-inch drivers}. Each of the locomotives in that series did undergo rebuild during the 1940's when troop trains were running. If the drivers were not changed in 1928-29, they surely were changed during the 1942-1945 rebuilds.

George Nelson

Last Edit: 11 years 1 month ago by WindsorSpring.

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M1sa vs. M1sb...? 11 years 1 month ago #816

Wowak OFFLINE Engineer Posts: 101 Thank you received: 8	Very interesting. That throws a slight wrench in my plan to model the late 40s. I wonder if any didn't get the bigger drivers.
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M1sa vs. M1sb...? 11 years 1 month ago #838

glenonoko
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Apprentice
Posts: 12
Thank you received: 5

Bee Line issue #1&2 for the year 2000 covered Class M-1 in detail. From that magazine: #1700-1726 were originally built with the 61-1/2-inch drivers, while #1727-1756 originally had the 55-inch drivers. The smaller-drivered engines were bought for pusher and coal drag service, but they were mostly bumped from these assignments by the subsequent deliveries of Class N 2-8-8-2's and Class I-10 2-8-0's. This made the smaller drivered 1700's somewhat surplus, with many of them stored in the Depression. Thus 1747-1756 had the larger drivers installed in 1928, and 1727-1746 got the bigger drivers starting late 1941 through 1943. The last one converted was #1731 on 12/15/43.

Regards,
-- Rick Bates

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The following user(s) said Thank You: Wowak

M1sa vs. M1sb...? 11 years 1 month ago #840

Wowak OFFLINE Engineer Posts: 101 Thank you received: 8	So that settles it... a small-drivered M1sb would never have shared the rails with a T-1. Looks like I'll be invoking rule #1.
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M1sa vs. M1sb...?

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