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

Anthony Thompson <thompson@...>

Schuyler Larrabee wrote:
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.
Schuyler is right, and the idea doesn't require separated panels; the segments and their ribs can all contribute to local expansion, even if the roof is welded. OTOH, stamping an entire roof is a pretty big die and a pretty big press, for no real gain that I can see.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705
(510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...
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