The fix is simple. "Update" to SP5 (everything worked there). And they can call it SP7 (and everyone will be happy). The Trainz game is not free. And it is not exactly cheap. There is no room for experimentation with a paid product. A paid product has to work.
Ivo
Good day
Yes, unfortunately it is as you describe. Large maps have a big problem after the update. What worked normally before the update, does not work after the update.
Map: A small piece of Europe 4:
ivomasek
ID: 276055