Re: X29 car owners
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Eric Neubauer <eaneubauer@...>
I was using "X29" to include all cars in
the one design family. Clearly there were changes over time as with any
design family, but among other things, the USRA designs had characteristic body
bolster designs, and if I remember right, the USRA box car design had a 9"
channel side sill, and the ARA/"X29" family had a 7" channel side sill.
Railroads tended to choose one design or the other as a basis for their orders
in the 1920s and early 1930s. The different side sills were compatible with
different body bolsters and other crossmembers, and so on. RDG used the
USRA designs as a starting point, but added some height and also used the end
and roof construction more commonly associated with the classic X29. If you use
an "X29" scale model as a stand in for a RDG car, you will have a different
underframe, the side sill will be too light, and I believe the side sheets are
layed out differently. CNJ had steel cars based on both the USRA and ARA
designs. LNE's two orders were based on the ARA design.
RDG copied the USRA 46' mill gondola very
closely for their 1920s orders. Some other railroads added height or length, but
still retained many design elements.
Eric N.
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