Left 4 Dead/The Church

From a train cart, make your way to the church.

Paths
The first area is open - but you need to go to the opposite corner of the area to reach the stairs.

Traps

 * The safehouse is occupied by a paranoid individual, who is most interested in his short-term personal safety. As the safehouse is a church, he has access to the bell to call the Lord's children to the congregation - even if they are infected.   He eventually succumbs to the infection and turns into a hunter.