Real world
This wagon is primarily used for transportation of metal sheet scrolls for the automotive industry. The covers protect scrolls from adverse weather conditions. The wagon can be usually seen in long coherent sets in almost any state of Europe.
Model
Just add buffers (order here or here) and two Y25 type chassis and paint it and you are ready to go! Two hexagon bores at the bottom enable you to add two M3 nuts (1.4mm height), so you can screw chassis to the frame and easily dismantle them later on. Use 7.7mm diameter wheels only.
Due to the technological requirements, the wagon has partly opened bottom, which allows you to add an extra weight by inserting a piece of metal inside (do not forget to fix it with glue - definitely use super glue).
Technical specifications
You can order Y25 type chassis here.
You can order buffers here or here.
You can order optional accessories here.