Part 27

When you catch up to the rail car, hop onto it, but don't start it up yet. Look ahead to see two large wooden crates to the right of yet another barrier arm. There are marines hiding behind those crates, and they'll bust the crates and open fire if you move toward them. Stay where you are and get out the assault rifle. Shoot the crates to pieces, then shoot the marines, who will be too far away to return fire.

After they're both down, crouch-ride the rail car forward until it stops, then crouch-walk off of its right side and go grab the marines' guns and AR grenades.

Use the switch on the wall to raise the barrier arm, then quicksave. It can be a bit tricky to crouch-jump your way back onto the rail car.

When you make it, get the car started again and ride on to a spot where the track curves left.

You can stop the car and get off of it. You could go right and then left (using the side ledges to walk on, as usual) to shortcut your way to the long ladder that leads down to the next section. However, to get more bullets, crouch-ride your way through another area with crates going across it, and keep crouch-riding until you're past a rocket emplacement.

As soon as you are, stop the car and walk over to the emplacement. The marine will just stand there and let you crowbar-whack him and take his gun.

Past the next corner, stay crouched to avoid zap damage until you reach a track switch. Shoot it with the pistol to flip it, then back up a little if necessary (still crouching) so the car will go straight past it instead of turning left.

Keep riding along until the car stops at the edge of a rail car elevator shaft. Get off of the car and start climbing down the nearby ladder to reach section c2a2g.

As soon as this section loads, stop moving and drop a hand grenade. Go a ways back up the ladder right after dropping the grenade so you won't take any damage. It'll blow up some tripmines in the area below for you, plus knock over a turret without getting the others all riled up.

Go down the ladder until you can look up to see the doorway to a small supply room, but don't go so far down that you'll hit the red laser alert. While still on the ladder, toss two hand grenades so that they'll land inside the supply room and blow up the zombies in there.

Jump off the ladder to avoid hitting the laser alert, then go into the supply room to find lots of hand grenades and a first aid station.

Leave the supply room and make your way carefully past the turrets on the left side of the track.

When you come to where the track turns left, quicksave. Run and jump over the track, then quickly run up behind the nearest large wooden crate.

Crouch down and push the crate a little to the left so you can see and shoot the marine at the small sandbag wall ahead. Use the .357 for a good instant-kill head shot. He probably won't fire at you, but if he does (or if both of the nearby crates get destroyed), quickrestore and try again.

If both crates survive, bash the nearest one and push the other one ahead of you as you move toward the marine's sandbag wall.

When you reach it, bash the crate to get a tripmine, then go around the wall on its right side. You'll then be able to run up next to the mounted gun's sandbag wall and shoot the marine who's in there by jumping up and down so you can see him.

Go down the corridor past their area, and start crouch-walking when you come to a doorway that leads outside. There are two marines out there facing the other way. Get out your C4 satchels, jump-toss one their way, back up, and detonate it.

After claiming their dropped weapons, turn left from the bottom of the steps and go all the way forward, jumping the rail track on the way. Look up to see a bit of camouflage netting up on the cliffside. That's the first sniper of the game, and you'll want to take him out. The easiest way to do that is to throw a grenade of some sort up there. An AR grenade is recommended since you'll be getting more soon. You'll know when you get him because he'll make a few gasping and choking noises.

Look for a streetlamp with a crate and a health pack on a machine next to it. Jump onto the machine from on the crate if you need health, then bash the crate to get shotgun ammo.

Find the large "BLAST DANGER" doors near the streetlamp and open them by using the controls on the wall to the left of them. Go through them and use the next set of controls to move on to section c2a2h.

There are three marines in the area that's ahead and to the right, and the big mounted gun that's to the left isn't the best way to deal with them. Crouch-walk your way very slowly along the right wall until you can sneak-shoot the leftmost marine with the pistol. The other two are harder to sneak-shoot, but it can be done. Or you could quickly duck out of cover (press the cover button to crouch behind walls or objects) long enough to launch an AR grenade at one of the marines to take him out quickly, then back up and shoot the last one when he runs into view.

If you're not playing the Source version of the game, you can use a shortcut here. Jump-crouch onto the smaller sandbag wall, then jump-cro