"A shrinking supply of boxcars--once the ubiquitous symbols of U.S.
railroads and a rolling bellwether for the economy--is causing a
freight-hauling crunch for the industries that continue to use them.
The number of boxcars in service in North America fell by 41% in
the past decade to just under 125,000 last year as 101,600 cars were
scrapped and only about 13,800 replacement were added."