2-8-2s tended to be the primary unit,or units out of Rigby/St. J. in the 30's and 40's. Since Bartlett had some 2-8-0s and 4-6-0's more or less "based there",they were used as "helpers" on the heavy wetbounds through the "Notch."
Some freights got two 2-8-2's out of Rigby,so needed none, or just one helper up the "Notch".
Turntable at Bartlett was taken up,when the 2-6-6-2 Mallets bought from the B&M. in 1912,as they wouldn't fit,and a the other leg was constructed along with the existing track from the old Bartlett & Albany railroad,to form a wye to turn the power.
According to the "Mountain Division Book",these engines were more or less "permanently assigned' to the Mt. Div. in the 1940's
Eleven 4-6-0's used on the "local trains" and Beecher Falls Branch-as well as helper-when needed.
Twelve 2-8-2s for through freights.
In addition,2-8-0's,usually ran the Portland to Bartlett "local freight" and were pressed into helper service,if available at Bartlett.
Exact engine numbers are in the book,and keep in mind,that steam locomotives needed a great deal of "maintaining",so while "assigned",several were usual undergoing servicing and inspection,often times at Waterville.
Hope this helps. and GREAT action video's of the helpers(taken on color 16mm film of course, by Stan Whitney in 1946-50) on the video; "New England Glory", Volume 1. produced by Herron Rail Services in 1990
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Bud