To do the darkslide in the new location, ride goofy (i can't seem to get them to work in regular) ollie high, double grab, then turn into a fs overcrook. Do this with one push, and start the overcrook in the middle of the rail. That's all there is to it. The rail is at the matrix plaza, to the left as you go upstairs. It's super glitchy, enjoi.. (less info)