Re: Photo: ACL Ventilated Boxcar 37853 With Live Bees Load (Undated)


Dennis Storzek
 

On Thu, Aug 18, 2022 at 01:18 PM, Robert kirkham wrote:
The car has interesting roof fasteners.  The ends look familiar, but the number per “panel” surprises me.
This is an example of a NONflexible metal roof, an early form of outside metal roof. Originally the folded edge of the roof panels was just nailed to the fascia, but 'weaving' of the carbody tore them loose. This was the next step in the evolution, many angle clips screwed to the fascia. That kept the panels tight to the fascia, but they tore at the seams. The ultimate solution was to introduce a slip joint at the fascia and enable the panels to slide a bit under the seam caps; the flexible roof that all three major roof manufacturers were offering by the twenties.

Dennis Storzek

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