You can get one for around ten bucks, and with it, you can saw off the kinks on those rails. It definitely takes some elbow grease, and it's kinda noisy, but it works. Sawing through a weld is really difficult, but sometimes it's necessary. As for those little white discs, try taking dad's sledgehammer to 'em. Oh yeah, this is vandalism, so always have someone watching your back.
Skaters are, and have always been, a resourceful group.
There are many other ways to take back a spot, too. You can use work lights and an extension cord if there's an outlet nearby, if not, try your car lights. Get some friends together, and invest in a generator. Believe me, it's worked. From now on you should look at every spot differently.