Hold on guys, Stonelouse might have a point here…
CrunchyBiscuit, in your example are the yellow and blue train running on the same line? In real life, at least around here where I live, there are never two trains on the same line active at the same time in the same station. It would not make much sense; which train should the passengers board?
I know this was possible in OTTD but there the concept of line is different and as far as I understand, trains travelling on the same route have no knowledge of each other and this is why they often end up in the same station at the same time.
Now, if blue and yellow are two different lines, there might be a problem… I haven’t reached such a scenario yet.