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Half-Life 2 Hints
Section 1: Dr. Kleiner's Lab (d1_trainstation_05)
1 of 13: After Alyx leads you into Dr. Kleiner's lab, just stand and wait or look around at stuff until Barney shows up.
6 of 13: After the problem is fixed, you'll be told to flip the activation switch.
7 of 13: It's the little red handle that's at the top of the control box just to the right of the big plugs. (The glass covering over the switch will rise when you're supposed to flip it.)
8 of 13: Alyx will be sent safely to Dr. Vance's lab, and then it's your turn. Get onto the teleportation platform and wait to be teleported.
13 of 13: Soon after you go through a door at the top of the stairs, it'll close and lock behind you and you'll start Section 2: Crossing the Train Yard.