Re: boxcars can be lined up on two tracks


Most flat roofs of that era and later in the Midwest are "tar paper".  More accurately; roofing felts tarred over in several layers.  I have crawled over many and on hot days, had the gooey tar on as many pairs of shoes.  The felts do not have a granulated top coat, just goo.

Mike Aufderheide
Architect, shoe cleaner.

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