The trolley lever is very easy to miss. After going to the Abandoned mines, go down 2 levels. After you get off the 2nd elevator, you'll face a 4-way intersection. Turn left, and look for a room on the left side with a bunch of tombstones in it. You should get one of those "verbal cues" from the narrator about the tombstones being out of place. Look just to the left of the tombstones by the broken cart. There'll be a rod lying on the floor. This is the trolley lever. Use "Spirit Eye" if you don't see it at first.
For a better walkthrough, check Xignal76's site (which I don't have the URL to)...
-Sazerac
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