Re: Detail of AAR 1937 boxcar - Murphy and Hutchins Roofs

Manfred Lorenz

--- In, "Schuyler Larrabee"
<schuyler.larrabee@v...> wrote:

Manfred Lorenz:

Why did the manufacturers use small panels anyway? Why didn't
they simply cut a sheet of steel the length of the car roof
and weld it together? Why these individual panels with the
accompanying troubles of making all those seams? Same for the sides?
Expansion and contraction, a significant dimension over a 40' car, is
absorbed by the individual
panels. Yes, the entire car expands and contracts, but the joints
help deal with it.

Ships should do the same and have seem to have no problems. That is, if
they are not named Fitz.

As long as the materials have the same properties there should be not a
problem with temperatures I think.


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