besides talking about reality, sometimes people should also be allowed to dream. hence the "fantasy" topics.

well, this forum so far as I know (because I only joined recently) has a real wealth of information such as the different bus models and routes and history of bus routes n interchanges and etc etc etc. also bus fans here have their ideas and comments about present services and how they might want to better improve it, which may not happen in reality immediately, and hence all the fantasy topics.
just my perception as a student, after taking a look at how all the wealth of information all my qian2 bei4 here in this forum have.