Started a new good map and was going to prepare the ground to make the perfect 100% planned city. So I started to stomp the ground by laying parellel tracks adding new on one side and removing on other side so to work my way forward and create perfect flat ground.
I was working with this and had some horse drawn cargo routes to support me economically. Then suddenly a black line appeared from the sky going straight into the soil. Oh great, graphics bug. I kept going but could not add another track. WTH? hmm, then I saw I was in debt by an incredible amount of money like 270,xxx,xxx,xxx,xxx B , B is like billions? jeez.
This means the code still have bugs, and one part of code is overwriting memory used by other parts of the code. This is not a stable product this game.