I decided to create a 3D-model for a typical Swedish passenger shelter. This one is a bit special since it's actually a split-level building. The real one had a massive concrete foundation and a wooden top. It's drawn to full scale (because I had the original blue prints and it was easier to work with full scale). I have printed mine in LGB-scale (4.44%) and we now use it on our garden railroad. It has received the fictive name "Karlsdorf". You need to scale the stl file to suit your needs. The roof can of course also be made of a plastic card. I had to cut it into three pieces to fit my printer.