I wanted to create this topic to share possible endings you've got in the game, as I know there are a great many.

So, I'll start:
1. Don't go to Tyler's apartment at the start of the game, and go speak to Herr Schmidt. He will get agitated and go find Tyler himself. You get arrested.
2. Throw Tyler's body from the train and get caught by the police at Epernay.
3. Allow the conductor to find Tyler's corpse in the bed. Caught by police.
4. Leave Tyler's room with a bloody jacket. Caught by police.
5. Milos slashes your throat in Tyler's room.
6. Vesna surprises you with the sword and kills you.
7. You get killed by the unarmed Serb or the guy with the crowbar.
8. Defuse the bomb incorrectly. Blown up.
9. You get killed by Vesna in the sword-fight, the knife fight or by being mashed against a tunnel roof.
10. You escape with Anna in Constantinople but she decides to return to Austria to help the Empire. (Good ending?)

Don't loose rear cars in the last part of the game; train don't go past the Serbian border, Anna tells you to stop cause there are too many passangers on board

Don't set the transaction with Schmidt after the concert. Simply, just don't show him gold. He orders to unload cargo at the Vienna station, angry Milos orders Vesna to stab you.

- Pull the emergency brake. You will be arrested.
- Allow Tatiana to catch you in her compartment with the egg from the bathroom. She will be outraged and demand it back. There’s no way to get the egg again. A dead end.
- On top of the train during the concert, go to the engineers at the front of the train several times. You will get kicked off the train.
- Break the skylight and enter Kronos’ car *before* the concert. Kahina will kill you.
- Allow Kahina to find you in Kronos’ compartments during the concert. She will force you to leave without the briefcase.
- Don’t go see Kronos when Kahina tells you to after the concert. Eventually she will find you again and kill you.
- Go see Kronos after the concert and give him nothing. Kahina will kill you.
- Go see Kronos after the concert and give him the egg. You will leave the train with the gold.
- Arrive too late in the bagage car to save Anna from being killed. You will be arrested.
- Go talk to Abbot, you won’t have the chance to find and defuse the bomb. KABOOM!
- Don’t bring the egg with you across the border or don’t close the egg when Kronos tells you to. He or Kahina will kill you.
- Don’t blow the whistle after the bird has sung, give the egg to Kronos. He will leave and you will die in the explosion.

I like the George Abbott one. "Dynamite? What dynamite?"

BOOM

What exactly is the best ending?

Those aren't actually endings, just ways to mess up and lose.