the problem is that pretty much everyone who does these videos has just started a new game so their networks are pretty limited. they also happen to build isolated lines instead of proper rail networks and they have a habit of building way too many bus and truck lines for a game thats called train fever…
if those people were more interested in real life train operations i think their videos would be more interesting.
there is a guy on twitch streaming gameplay without comments who builds massive networks, you can rewatch those streams here: http://www.twitch.tv/zuerihb/profile/past_broadcasts
sadly those saved videos of past streams on twitch are seriously lagging for me.