On Tue, Feb 8, 2022 at 09:07 AM, Tim O'Connor wrote:

Unfortunately, although I am sure that
railroads knew exactly what kind of traffic (online vs bridge) they handled, that kind
of data is pretty hard to find.

That data is getting easier to find the more are digitized and put online. In this case, GB&W has a listing in the 1945 Freight Commodity Statistics. For ores and concentrates NOS they bridged 330 tons and handled no other traffic originating, terminating, or local. For products of mines NOS, they handed 12103 tons terminating and 10792 bridge. For aluminum ingot pig or slab, they bridged 157 cars at 7,958 tons and handled no other. 

#112 - Freight commodity statistics of class I railroads ... 1945. - Full View | HathiTrust Digital Library


 
--
Mike Clements
Wakefield, MA
nyc65.wordpress.com