--- In [email protected], Pieter Roos <pieter_roos@...> wrote:
> I don't recall whether the Ace roller bearing trucks had covered >bearings,
> but AM, SHS and SSA RB trucks all appear to have open >bearings. maybe we
> need someone to make a bearing cover to go on the >current trucks to make the
> earlier style.
>
The early covered roller bearing trucks had a different sideframe shape
than the common spinning end roller bearing trucks that SHS and AM make.I don't
know if anyone makes the shape in S scale but Athearn makes an O scale version.
I can't recall seeing the covered roller bearings on regular freight cars, they
seem to have been used on special cars like express boxcars etc. The normal
open roller bearing cars started to show up around 1957 here on the SP on new
cars like covered hoppers. They were still uncommon enough to make us kids
chase them in a train. In just a few years lots more new cars showed up with
roller bearings but there were still tons of older friction bearing cars in use
and they ran many years with their original trucks, sometimes with roller
bearing conversion bearings and sometimes just with the friction bearings.I
imagine the railroads had schedules of car life and return on investment that
told them how long to use the cars and if the their revenue was worth replacing
the bearings?...DaveBranum
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