Intensity of freight traffic?

[nw-modeling-list at nwhs.org]

"I'm trying to get some idea of the intensity of freight traffic on the
N&W main lines during the period 1954-1958.

For instance, in a normal daytime period of, say, 3 hours, how many
freight trains would a railfan situated on Blue Ridge be able to
observe? "

David stephenson touched on this in his article about Bud Swearer's tapes in 
the latest issue of The Arrow.
Jimmy Lisle