Reason why my first is going to friction

[jldwolfe]

Full size friction drive

http://www.youtube.com/watch?v=D6gskSwZkls&feature=related

Kinda revers of what is done on bikes but.......

 

[GearNut]

A bit slow, isn't it?
It is pretty cool though.

 

[Stan4d]

Very cool, I have seen BNSF pickups equipped with a similar set up.