Bridge to Trolley
When you cross the bridge, it caves in behind you. No going backwards now! She'll open the path before you, and go in the door.
A few more monsters show up, fight them. The door ahead leads to another broken bridge. I guess the bridges around here aren't very reliable. Instead, go down into the trench and push the box forward. Stairs appear as if by magic. Head up the stairs, and walk her all the way down to the closed door at the end.
Leave her there and jump over the edge to the floor below. Go forward to the lever in the far corner, which opens the door. Go up to the door via the stairs and get her. Bring her down the stairs, back towards the monitor and to the right to a chain. Climb up the chain.
As soon as you reach the top, monsters will appear. Jump down immediately to fight them and save her. Once they're all done, climb back up the chain and push the block off the edge. Now push it to beneath the chain.
Climb back up the chain (for the third time!) and go to the very edge of that level. Call down to her with R1. She'll get up on the box and jump up to your hand.
Go out and up two flights of stairs. Note that monsters will appear up on the 'top of the building'. If the flyers get her, run to the hole to the north - you can drag her back out pretty easily.
Once you finish them off, go to the back left corner, for the "Stg: Trolley 1" save point in chair.
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Forum to ask me how to get through if you're stuck somewhere I haven't put up yet. I'll get back to you quickly.
Review of Ico