If boxes are minivans, rails are sports cars. They have similar components and require similar skills, but one is faster and a little riskier but also more fun. You’ll easily get off-kilter if your feet get ahead of or behind the sliding surface. Start on a low straight rail. If there’s a gap between the ramp and the rail, judging your speed is key. Make sure you have enough to clear the gap, but not so much that you get out of balance at the takeoff.