The fixed trolley cart can bring you to 3 different locations, depending on the setting of two switches (you should have found one of them: pulling it toggled an arrow between two sets of rails.) You need to visit all three, so be prepared for some running between switches. (It helps a lot to cast 'create portal' at the starting point of the tracks.) One area contains a lot of lava, and ore piles with dragon ore sometimes. (I found two both times I was there.)
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