Well , at this point , I would like to remind everybody that , this is a video game ,and video games are not meant to be real. their existence is based on imaginations and creativity and I am pretty certain that Devs will find some sort of creative approach to introduce the content that is highly demanded by a huge fan base and make sure that some people who want to play just with trains and trucks , can play without any of thier realism destroyed.
for someone complianing that you need a 500 km area for planes , you should realise that these high speed trains , and vast networks of trains don’t exist in 16 km area in realism, the tens of big cities don’t exist in a 16 km area . so please stop baseless discussions of how planes will destroy the realism.