They indicate that the railroad has been cut and needs to be repaired. This tends to happen in the East where Russia used a wider gauge than those nasty Western Europeans. See "Railroad Conversion" on Page-37 of the Big Manual.
Durk wrote:In my experience, most crashes are due to either not running in admin mode or running multiple games without exiting.
Just one more question.. You were playing with it patched to 1.05, yes?