Part 4

Access the wall dispenser (WD) to increase your health to 100%.

As you approach the intersection, turn left into the highway and sprint at the group of enemies. Drift left to the wall and slide along it to POS#1, who is standing over a body and wielding a pistol.

Run into POS#1 and begin to knock (KB) him. Turn slightly to face him while swinging. He drops after 4 KB strikes.

As POS#2 approaches, back away along the wall toward the exit point (XP) and KB him while back stepping.

As soon as POS#2 drops, sprint forward and around the woman kneeling over her companion.

Pass close by her to acquire the pistol and continue to the boarded-up XP. The game auto-arms you with the pistol, but switch back to the knock (KB) pronto.

Sprint directly at the XP, KB the top board only, then jump through. Sprint up the first flight of stairs, then slow to a run to travel over the platform and begin ascending the second flight.

This positions you to encounter POS#3 descending the third flight. Begin sprinting up when POS#3 is about 4 steps from the base of the third flight, KB him on platform#2, and take his pistol.

Warning: If you move too close to platform#2, POS#3 will stop mid-flight and begin firing on you.

Take the ammo, sprint up to the large concrete platform, switch to the pistol, and run right toward the base of stair flight#4. Begin strafing left before reaching the stairs.

Begin firing on POS#4 as you run up the flight, do not sprint.

On the main platform, quickly locate and sprint to the XP stairs past the explosive barrels (EBs) leading down to the tracks and hold at mid-platform for the train.

With your back to the wall, look for the section of sheet metal blocking the view of the boarded-up XP. Look at the platform across the tracks at your 2:00; this is your route.

Look to the right of the sheet metal for 3 boards very close together. Look down from the 3rd board past the whitish trim blocks to the white grout line aligned with the top of the XP platform. Maintain this point and angle.

Once on top of the train, press run and jump as soon as the leading edge of the XP platform appears in your peripheral vision.

Run and jump to the train as it begins to pass, release run before landing on the train. When the leading edge of the platform appears in your peripheral, run/jump off the train and land on the ladder.

Climb the ladder, sprint to the buildings boarded up XP (entry point), and switch to the KB if not already in hand.

Warning: You must be standing just left of center of the buildings EP to quickly make the jump over the low end of the bottom board and avoid damage from enemy (POS) gunfire.

Warning: In HL2ud, there are too many items blocking access to the XP to remove without taking damage; it is better to enter the XP room, move to the wall closest to the tracks, stay away from the windows, and shoot one of the EBs to clear the XP, then sprint through it.

Before coming to the corner of the building leading to the EP, slow to a run and begin a run/strafe left tactic to face the EP as it comes into view.

Release strafe just before aligning with the EP, aiming to hit the EP just left of center. KB the top board, hop over the bottom board, then run to the right into the XP room.

Sprint straight into the EB blocking the XP, pick it up, and drop it outside to the right of the steps.

Run outside, KB the security camera (SC) if you've been using too much ammo, otherwise ignore it. Open and pass through the gate at a sprint along the building to your left.

Continue straight past the corner on your left and drift right past the building corner to your right.

Look for the bent over section of fence at your 10:00 as you sprint past the corner of the building. Jump over the lowest section of the fence, swing wide left to the fence, and continue sprinting along it until you can turn and crouch past the corner.

Do not stop moving and enter the duct. KB the SC, turn left, and head for the duct grate.

KB the grate, creep out enough to stand, and sprint to the far end of the walkway (Wkwy).

Switch to the pistol while sprinting to the opening on the left at the end of the fence. Side step left off the ledge, press strafe right, and drop onto the pallet if possible to minimize or eliminate damage.

Run forward and drift left. As you approach the closest EB, send 3 rapid rounds into the second EB (closest to the corner) to kill the POS that you may or may not see around the corner.

Note: In Half-Life 2, there is a suit battery (SB) under the stairs that lead to the wall dispenser (WD); the SB is not available in HL2ud. If you go for the SB in Half-Life 2, be prepared to encounter the next POS.