How long does it take to unload

[Brakie]

I think with a boxcar you can reach both sides through one door. On the centerbeam, you can't unload the far side without going around.

What I meant was does one end get completely unloaded then the other end or does the car need to be unloaded equally from each end?

Having unloaded boxcars with a forklift I can say it don't matter which end you unload first once you remove the center of the load that is located between the boxcar doors.

The center beam must be unloaded equally since the car is a tipping hazard..