2 Dead Bodies
You're on a train, probably for business or personal reasons. You just expected 5 days of peace and quiet. Then came the 1ST body, they had found her body in the cargo cart, 5 stab wounds, dead. They tried to keep it a secret, in order to keep everyone calm. They found the 2ND body in one of the bathrooms, 5 stab wounds, dead. The train is now on full lockdown, no one is allowed to go in or out of their carts, only security and police personal. You are now stuck in a cart with 4 other people.
Little did you know
1 of them was the murderer.
I really hope that people know the etiquette of role-playing by now
Swearing is allowed
Blood and some gore is to be expected
If I don't know you, I'll need a writing sample from you
No means No
Don't try and do anything important when I'm not there.
Reason they're on the train:
The clocks ticking
I'll be waiting