markus_GE, on 01 August 2013 - 11:13 PM, said:
Cheers, Markus
Unloaded? No way. You're talkin about 30 tons of rotting flesh inside a box that's been out in the sun for n days.
Cars under 40 years old were interchanged w/o constraints. Cars over 40 years were not supposed to be interchanged, usually were not interchanged, but in rare cases it occurred. I think it obvious that cars that were 40 or more years old were kept around only because the service was local. Once "in the loop" it was not likely to stray.
Next, factor in that the service lifetime of boxcars was usually less than 30 years, made obsolete by their smaller size, soon-to-be-required regulated expenses, or an accumulation of minor damage. Such cars could be put into hide service, interchanged, and when it finally became necessary to spend any money on them... scrapped. Basically they're squeezing out the very last drops of use before tossing it out.