Hi,
I know a few retirees from the Duluth South Shore and Atlantic railroad and their railroad was very popular with agents for rolling lumber to redirect rolling shipments after it was sold. The railroad ran from the combined Duluth, MN and Superior, WI rail terminal (GN, NP, Soo Line, Milwaukee Road, DM&IR, DW&P, C&NW railroads) east across northern Wisconsin and upper Michigan and connected the the Penny and NYC via the carferry at the Straits of Mackinac. The DSS&A also interchanged with the Soo Line, C&NW. Milwaukee Road and Ann Arbor (via its M&LS & carferry connection) between its end point terminals. The retirees told me shipping agents created all sorts of varied shipping routes for the lumber, but always stuck in the DSS&A somewhere along the route. They then notified the DSS&A that when car number xxxx arrived on their railroad, its shipping route was changed to a new final destination.
Andy