This is one of the most modern ways to get started. The Free Starter Pack gives you access to the Training Center , where you can learn the fundamentals of operating various locomotives in a controlled environment. It is available on platforms like Xbox and Steam.
Sites like UKTrainSim often host "freeware packs" that add new routes and trains to existing games at no extra cost. Train Travel Simulator Free Download
Many premium simulators offer free "demo" or "starter" versions that act as a gateway. This is one of the most modern ways to get started
Steam is the most common hub for PC sims like Train Sim World . Train Travel Simulator Free Download