Shoot another thug from above. If he runs off before you kill him, either hang from the edge of the machine to get his attention, then pull up and shoot him; or drop down and finish him, then climb back onto the machine; or just let him go and deal with him later.
Hop over to the top of the next machine (i.e., the one closest to the ticket office) and jump up to grab the block with the metal coils you moved earlier.
Climb into the passageway above.
Drop down through the other opening. (You'll land on the other side of the movable block.)
Then climb down into the ticket office.
Here you'll find a large medi pack and the MAINTENANCE KEY.
Press the button to open the doors so you can get out. Finish off that thug if you didn't do so before and loot a small medi pack off his body.
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