Originally posted by OrchidJulie Interesting! A question, if you know -- what are the curtain-like things below the containers, covering the wheels and trucks? I don't think I've ever seen those before (it's been a long while, but I've chased a few trains
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The rail cars that carry shipping containers are built to handle the containers stacked two high. So the car is built with a drop to get the bottom container as low as possible so the second container doesn’t make the car over height.
The “curtain” you see is the structure of the rail car. Since the bottom of the car is so close to the roadbed, the sides are built to carry the load, much like a floor truss in a house or commercial building.
The rail cars share trucks at each end, the trucks supporting the trailing end of one car, the leading end of the next.
Like this: