Severe crop, convert from RAW, levels, curves, dodge & burn, cloned out a tiny bit of skyline, sharpen.
I did sacrifice a muddy light blue sky for white, which allowed the indistinct building shapes at the base of the cable car to miostly go away. Since San Francisco has frequent fog, it still is a pretty genuine image of my City.
I stood on California St. just below where the cable car goes over the hill, for a loooong time. When the cable car came by, traffic came with it. It took a while to isolate the cable car without the traffic, and I loved the funny looks I got while I waited it out.
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You've used the featureless sky in the background quite nicely to isolate the trolley car. Interesting approach on the text. Good luck in the challenge.