Burgythis thread will help man. https://www.newschoolers.com/forum/thread/812978/Gonna-sound-dumb--but-help-with-urban
THEDIRTYBUBBLEDo not start your urban adventures on a rail of that caliber, unless you are extremely confident in your skills.
If you scraped it and you don't carry a ton of speed, you can slide through the rust. Most likely however, you will just get a nasty edge catch.