Model railroading has always been mostly focused on locomotives, trackside structures, rolling stock, and what are called layouts. The best of those are elaborate dioramas, but the skill goes all over to include lego style track modules.
It's a rich history. Older issues of Model Railroader Magazine include everything from DC elecrics to photography, machine tools for making parts, build your own pinhole cameras.
There was a period in US railroad design named the United States Railroad Administration that produced a series of standard designs during WW1. Those would translate well into models as the components were standardized and power/ weight/ dimension standards were set.
In a way because of that, model railroading might be seen to divide itself between operations (the NFL of that hobby), and stationary modeling.
Pause for popcorn. Model railroading has a deep history that has it's basis in Europe but became popular with "train sets". Lionel and Marx and Marklin and Hornby come to mind.
Stationery plastic locomotive kits usually are linked I think to museum shops. They can't be made to run, but are good looking reminders of a preserved unit.
Again, there are a lot of beautiful paper models of Victorian era steamers, which the OP asked about.
https://www.pinterest.com/pin/597852919256709834/