Charlie,
The first Milwaukee Road F-6 and F-6A class hudsons were contemporaries of the Q S4s, very likely designed at the same time. The 14 F-6s were delivered in 1930 gwhile the 8 F-6As were delivered in 1931. Both the 22 Milwaukee and the the first 12 Q hudsons were built by Baldwin 1930 while Milwaukee's 6 later streamlined F-7 hudsons were built by Alco in 1938.
According the Hol Wagner in BB no. 33 on the hudsons, he indicates that Baldwin drew heavily on the design of the heavy USRA pacifics built 12 years earlier. In fact, he makes at least two references to that point. I would suggest that the last Southern Ps-4s built in 1928 by Baldwin (all of the rest were built by Alco) may have also influenced the design of the Q hudsons.
Bill Barber Gravois Mills, MO Mon Oct 5, 2015 11:15 am (PDT) . Posted by:Louis and all-
As successful as the NYC Hudsons were, they were really just enlargements of their last class of Pacifics..
The CB&Q S4 was essentially a brand new design. I haven’t looked at the drawings for the MILW “Baltic” F6 but I would guess that the Q engines owed more to that design than the NYC. The NYC had to be designed with a tighter profile than the CB&Q engine.
The O-5 and S-4 were concurrently designed and share many details.
I wonder if the CB&Q even considered Berkshires….I think they probably felt that the Northerns filled the niche that they would have addressed and that there was no need to adopt that wheel arrangement. The O5 was a dual service machine and the roads that had both Berkshires and Northerns tended to have more passenger-service design 4-8-4s (RF&P, MP) and most roads that had good Northerns did not have Berkshires (NYC probably thought that their Mohawks filled that niche and the P&LE Berks were more experimental outside of the NYC mainstream motive power thinking).
Charlie Vlk
__._,_.___
Posted by: William Barber <clipperw@gmail.com>
![]()
__,_._,___
|