Yep, I have experimented with it a bit. Even though I knew from some reviews that the game lacks “PBS” from OpenTTD and TTDPatch, I have not understand this part from your example of rail design with signals. Hm, that sucks… Pitty, I am still switching between “like the game” and “annoyed”. To build a bigger network then has to look really strangely…
And yes, well I am having lag at each month with a few tracks and vehicles, without any mods, so I can understand your frustration.