Looks safe, which makes it look fun because the skates are like connected to the rail
tcco...
...I don't think you have fully thought this out...

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According to Newtons Law of Physics, (and a sensible sort of Bloke), a moving body tends to want to keep moving on, even though the skates have accidentally jammed solid to the rails....

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Paul...feeling a bit Leg-less!... ;)...!
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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.