Unloading trains is actually very efficient. If you have a train yard with many trains lined up next to each other and with box cars aligned, you can easily carry goods from train to train, through the box cars. This is far more space efficient than the huge parking lot which is needed to accommodate the wide turns that trucks have to make in order back up to a delivery zone.

I also don't see why it would be necessary to revamp the global economy to start using trains more.