A few things people could look at in the game Go to Settings > Gameplay and you will see this If Career Scoring is un-ticked you will not get a Tick to say you have completed a Scenario Tick Auto-Coupling as it will help you when doing shunting and Free Roam Untick Passing danger signal ends game - it will tell you at the end it happened Tick Allow all Coupling - again it will help you when doing shunting and Free Roam Peter
As an aside - I think that you can also reset your "career progress", and I think this clears all of your ticks/stars, should you decide that you want to start again. (I will do this at some point, when I am more comfortable with having no HUD - sort of like "moving up a difficulty level"....). Gotta love TS1 for the replayability.