C&NW"Cowboy Line" - Classic Trains Magazine

A quick Yahoo!! internet search came up with this:

"C&NW began abandoning distant segments of the line in the 1960s. For a period in the 1980s, the Cowboy Line carried increasing loads of bentonite and coal from Wyoming. But, the company rerouted the business in 1989 and, in 1991, it filed an application with the Interstate Commerce Commission to abandon the Norfolk-to-Chadron portion of the line. The last trains ran across the northern Nebraska line on December 1, 1992."