your team from behind."

Detailed walkthrough for Left 4 Dead's 'your team from behind.' section, covering navigating staircases, catwalks, tunnels, train hopping, and the bridge encounter.

Go up the staircase past the door if you haven't already. The space beyond the window may contain some goodies, but otherwise follow the stairs up to a catwalk. Eliminate the Infected up here and on the structure just on the other side of the window outside. You can also stay on the first floor and take the back door outside, but I tend to find a Witch down here and avoid her altogether by taking the second floor instead.

Once you make your way outside, take down any Infected that run to your position. The tunnel here is in shambles as parts lay collapsed while others are sealed off by destroyed train cars. There is a table near the front of the tunnel that may hold upgraded weapons or ammo.

The top of the train cars can be accessible via the common yellow ladder, so it is recommended that you climb on top of the train cars and train hop as you kill the Infected below you. Beware that if a Smoker or Hunter captures you up here, it may take a while for your teammates to rescue you.

When you reach a red train car blocking the middle of the tunnel, scale the dirt mound to reach the top of the train car. If you haven't found the upgraded weapons in the level yet, this is the last spot to find them: the weapons are lying on top of the red train car.

Drop down and proceed towards the oil car, which can be climbed via the ladder. Kill any Infected past this point and enter the hole on the side of the wall. This narrow passage is the last place you will find Infected, since the safe house is right around the bend. Wipe anyone out, then rush into the safe house.

THE BRIDGE

After the pit stop at the safe house, exit and go to the left. If you want to stray from the path a bit, make a stop at the generator room across from the safe house; it usually holds some valuables. Otherwise, follow the red lights down the corridor until you eventually spill outside.

There's a high chance that you will encounter a lot of Infected, if not the Horde, out here. Keep an eye out for Smokers that target you from beyond the fence above the exit and other Infected that hide in the trees. You should be able to locate a fuel can or propane tank in the building near the exit.

Following the forest trail will eventually take you to a second building. If you are in need of items, you can stray from the path to the right of the building, eventually taking you to the ledge above the exit where you were before. There are a few sleeping bags on the ground that may be the home of pain pills or hand-tossed weapons.

Enter the building when ready. Head down the staircase to find not only a table, but a fuel can and some other stuff. The Horde will enter the building the same way you came, so take the fuel can and place it on the stairs. Light it just as the first Infected speeds down the stairs. Take out any last survivors, then continue through the building.

Before heading back outside, check the chambers to the right for any supplies. Once you exit out into the train yard, search behind the cars for Infected. There is also another table just outside the door that may hold useful weapons or ammo.

If you are attacked by a Tank in the train yard, refrain from entering the building that you came out of. You certainly don't want to get trapped in close quarters with a guy his size. You may also find a Witch instead; I often find her inside the small hangar just past the first two trains.

Speaking of the hangar, it contains ammo and other good stuff. Continue down the train tracks, weaving in between trains to hide from or possibly kill Infected. One of your teammates gets the bridge idea of destroying the wooden bridge above you. Before you jump to conclusions, enter the small house on the left side of the train yard for weapons or items. You may find upgraded weapons here if you have not already.

Approach the red train car and activate its emergency brake to send it careening into the bridge. Just as the bridge collapses, the Horde will appear. Return to the small house and wait outside and wait for the enemies. Do not hide inside the small confines of the house because you will just get swarmed. If you need ammo or pain pills from the first-aid station inside, then quickly run in and out.

Tip: Strategy by Carl C.

• Make sure one guy has a pipe bomb and one guy has some hot sauce. Pop the coupling for the train car and haul ass to where the bridge will drop. As soon as the infected get uncomfortable toss the pipe bomb, get on to the bridge and hurl the molotav at the entrance to the bridge.
• Now the team's on the bridge, anything chasing you on to the bridge will get a serious hot foot, anything in front of you will get mowed down. Just press forward and move into the safe house you shouldn't get little resistance from