I'll go to some pretty extreme lengths to only hit RR tracks at a 90degree angle. A couple of times even on busy roads I've "taken the lane" in front of a following car so I could swerve back over the tracks at the right angle. Haven't gone down yet, but I haven't done it very often when they were wet either.

Is it possible, or likely, to go down on wet tracks if you hit them at 90 degrees? Hard to see how, but I'm not sure.