The cart that you came down on had a trolley lever - the one on the other cart was broken - guess what you need. You will come to a few caverns, but the one you seek gives you some chat from the narrator, and the only other passage off it leads straight to a small platform lift (not the usual type) that goes to the first switching room. The cavern is I think 2 levels down from the end of your cart run, but there is enough passage criss-crossing down there to put anyones teeth on edge.
Good luck.
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