Try Magic Eraser & Dawn to clean that rail up. Get 'em at any grocery store. Looks like creosote? Hard to tell on the photos. If creosote stains, then I would try some Bug and Tar Remover on a cloth on one spot - maybe a 2 inch section to see if that removes most of it - then wash with Dawn and re-wax if you like it. Get a good glass man to look at the sore spots. Good luck.
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