Here is a simple page to illustrate the flat car.
I measure the flat car bed width at 104mm, height off the rails at 47, bed length of 504 (53 foot).
The photos were grabbed quickly so that there is something for you to see. I hope these give you the overall idea of the quality and detail on the model.
The springs in the truck frames are functional and allow around 2mm of movement.
The flat car models have been offered as basic wagons or with accompanying log, pipe, crate/container or vehicular load.
The underneath of the frame is once more ready to take the alternative american style G1 coupler