It's been noted that GN got these cars for lumber loading. If the car is loaded with 16' 2x4's up to the roof (not likely, of course), the load's 90,000 pounds.
For those of you who wish they'd had a chance to load such a car, each 2x4 weighs 18 pounds. Going up to 50, towards the end of your shift.
Ed
Edward Sutorik