Fast endless Bi-directional spiral with an ho scale train Powered by what appears to be seven HO-scale locomotives, Risner’s creation also works in reverse. Facebook Prev Article Next Article Machinery Checkout these cool gadgets... Related Posts Professor Poliakoff inherits an inventors perpetual motion machine Discover The Duke Engine a Different Approach to Combustion High-speed Steady Flight in Confined Spaces for Tethered Quadrocopters Fastest Wire Bending Machine is Addictive to Watch This Crazy Shape-Shifting PC Is the Gaming Rig Optimus Prime Would Use The Strangest Elevator In Italy