--- In [email protected], "rbnicholson2001" <[EMAIL PROTECTED]> wrote: > > --- In [email protected], "Gary Chudzinski" <[EMAIL PROTECTED]> > wrote: > > > > Any body know what year(s) roller bearing trucks and 36" wheels came into active use on freight cars with the major roads? > > ___________________________________________ > > I remember ads in the old RAILROAD MAGAZINE touting the benefits of > roller bearings c.1954, but I'm not sure when 36" wheels came into > common use. When I hired out on SANTA FE in 1964, the majority of > rolling stock still used friction bearings, but roller bearings were coming on strong with the new and larger types of rolling stock > beginning to appear. > > Bob Nicholson
I suppose the operative words are "active use". RB trucks were available for RR use in the late 40's, but the Pennsy was still rebuilding friction bearings in the late 60's. It's most likely to assume about a 20 year transition from one predominant type to the other. Same for 36" wheels, though they were driven by a desire to increase car weight hauling capacity. In the reverse of the RB history, the Pennsy used 36" wheels on H30a covered hoppers built in 1951-52. Go figure... Jim The poll results are in....... To REPLY to the list, use REPLY ALL, to reply to the sender, use REPLY. I do NOT know if this works on all e-mail software, but it works on some of the most common ones. For those of you on DIGEST mode, all REPLY messages go to the list. Change your membership, change your message settings, use our CALENDAR, view shared files or photos, view the list archives, GO TO http://groups.yahoo.com/group/S-Scale/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
