A scale model reproduction of an electric commuter train to be built in paper, card stock or even brass.
Note in the images that you even build out the interior.
There is a lot of work and a lot of detail in this model. So consider it a high difficulty model project.
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 )