If you are looking for specific downloadable content or "stories" (sessions) for the Polish version of the game, you can check official and community sites like Trainz Portal or the Steam Community.
The closest things to a story in TS2010 are the included with each route: Trainz Simulator 2010: Engineers Edition do pob...
: You can explore and operate historically accurate railroads, such as a steam railroad from days gone by . For example, the Russian/CIS version includes the "Fantasy" scenario , which takes you through the Ukrainian countryside, showing you the change of all four seasons during a one-hour trip. If you are looking for specific downloadable content
Unlike most games with a linear narrative, (TS2010) does not have a single overarching "story" mode. Instead, the game's focus is on building, operating, and exploring a vast collection of rail systems. Unlike most games with a linear narrative, (TS2010)
: For new players, the game offers a dedicated Tutorial Mode to teach the basics of train operation.
: The game provides tools like Surveyor and Railyard so you can create your own "stories" by building a railroad from scratch, ranging from a small layout to a massive 100+ mile prototypical route.