Resident Evil 5/Chapter 2-2

Train Yard
Go between the trains and you'll be ambushed by dogs twice. Kill the dogs and then the Majini (usually on top of the trains, though not limited to it). Climb on top of the trains (there should be a jewel beetle here if you turn around before climbing up the trains) and use a rifle to spot the BSAA emblem in the distance on the radio tower. Jump all the way across to the left and shoot the trap. Jump down and shoot the traps before you can get hit. Afterward, jump out of the mine cart and go down (before this, go to where the mine cart used to be and pick up the large gold.

Mines
Now you'll be in the mining areas. Pick up the lantern and the green herbs. Either have your partner carry the lantern while you shoot or the reverse. Someone will have to do a role either way. Go into the tunnel on the right for a red herb and turn around. Follow the left route where you'll step into some water. Shoot the Majini here and get out of the water to face another two Majini. Go to the left and smash open the two crates and barrels here, and then turn around and go into the water once more. Another Majini will be here. Walk a bit more and you'll make it out of the water. You'll reach a bridge with a waterfall. Turn right and look all the way up into the waterfall. Shoot the BSAA emblem here. Now go forward and take down the coming Majini. Follow either path and you'll be taken to a lit area. Here you can put down the lantern and go through another split path.

The person that turns the crank will have to turn around - an ambush is coming for them. The other person will have to run to the crank up ahead and open the path for their partner. After both of you are in the lit-up area, you'll be attacked. Climb up the ladder ahead and then go all the way to the right and climb the next ladder. Turn left and enter the passage. When you're in, turn left again and kill the Majini there. After they're done with, go to the elevator with your partner to exit the mines.

Cliffs
Climb up the stairs and go into the building. You'll find Irving, but he'll escape with the help of a colleague and a flash grenade. Go down the stairs and go to the right of the building. A Majini will be manning a turret. Shoot him down with a rifle and shoot the other Majini along with him. When you pass that, you'll see a tall ladder. Climb it, turn around, equip your rifle, and look at the building in the distance to spot a hidden BSAA emblem on the roof. Jump down and either assist/get assisted with the ladder to take down the Majini or both go up the swerving path and hit them heavy. Either way, kill them all and reach a large crate. Push it with your partner, go past it, and trigger a boss fight.

Always shoot the red area. Shooting its shell will only waste ammo and do no good. It's best to have your partner distract while you shoot or plant proximity bombs. Rocket launchers, grenade launchers, and grenades are as effective as always, so make good use of those. When it has had enough, it will fall down the cliff in defeat and the chapter will end.