Mechanized death ride.
Before activating the controls to the right, look at the base of the short set of stairs to find some COG Tags. When you've got 'em, hit the switch to the right to activate the mine carts and then hop in. Grab some ammo, and ready your Lancer Assault Rifle.
Oddly enough, there's not a whole lot to be worried about on the mine cart ride. The first part before the squad almost gets fried by the furnace has no enemies. Watch the ceiling along the path after turning, however, for a wave of Lambent Wretches that you'll need to kill, but completely ignore any Locust soldiers that fire on your cart. As long as you're ducked, you'll avoid their fire. The Wretches can hurt you if you let them drop into your cart, so be sure to kill them from a distance. Continue through the area on the cart while staying down, until you come across a dark hallway with a Boltok wielding Drone on the left. Blindfire at his knees to bring him down, then quickly face down the hallway and kill the Lambent Wretch coming at you from that area. Once that's done, you can safely enjoy the rest of the ride.
Once off the cart, you'll move through some linear halls between locked doorways. After each doorway, expect to run into a very small pack of Wretches—usually one or two at a time—before you can open the next door to continue. Eventually, you'll make your way to the core room.
Wait back near the entrance to the core room as platforms at the far end rise to your level. Each platform—one to the left, one to the right—is carrying a Boomer that's ready to fire the moment he emerges. Be ready with a grenade and drop it straight onto the enemy to soften him up, then continue with fire from safety (be sure to crouch if you see the Boomer fire) to finish off the enemy. You'll likely need to help your squadmates on the left take care of the second Boomer before stepping on the platforms and riding them down. Otherwise, you can just let your squadmates do all the work by simply ordering them to 'attack'. Your squadmates all have enough health to survive one Boomshot round, and the lengthy reload of the Boomers gives them plenty of time to regenerate health and give a massive amount of damage. Once they're dead, proceed to the lifts and head down where it's Darkest Before Dawn.
|Gears of War Walkthrough|
|Gears of War||Act 1: Ashes · Act 2: Nightfall · Act 3: Belly of the Beast · Act 4: The Long Road Home · Act 5: Desperation|
|Act 1||14 Years After E-Day · Trial By Fire · Fish in a Barrel · Fork in the Road · Knock Knock · Hammer · Wrath · China Shop|
|Act 2||Tick Tick Boom · Grist · Outpost · Lethal Dusk · Dark Labyrinth · Powder Keg · Burnt Rubber · Last Stand|
|Act 3||Downpour · Evolution · Coalition Cargo · Darkest Before Dawn · Angry Titan · Tip of the Iceberg|
|Act 4||Campus Grinder · Bad to Worse · Hazing · Close to Home · Imaginary Place · Entrenched|
|Act 5||(PC only: Impasse · Comedy of Errors · Window Shopping · Powers That Be · Jurassic Proportions) · Special Delivery · Train Wreck · Pale Horse|