A scale model of the train that you can ride at Wigry Poland.
You can read about the Wigry Narrow Gauge Railway at https://steamtraininfo.com/wigry-narrow-gauge-railway
The plan book includes the plans for the actual cars on which you ride as well as the engine that pulls the cars.
Build this in paper or card. The plans lend themselves to be used to make the cars in brass.
Comes to you in HO scale but can be built in OO and TT also. (See our instructions on printing in different scales at https://steamtraininfo.com/print-to-scale )