Patent ID: 7610861

Claim:
A propulsion system comprising: an undulating track having a plurality of peaks and valleys with up- and down-slopes therebetween and extending between a beginning point and an end point; an axle configured to travel along a long axis of the track and having a magnetic component oriented perpendicular to the track long axis, the magnetic component having a first polarity adjacent a first side of the track and a second polarity opposite the first polarity adjacent a second side of the track opposed to the first side; and a plurality magnets affixed in opposed pairs on either side of the track, a top end of each magnet oriented adjacent and on an up-slope side of each crest, each magnet top adjacent the track first side having the second polarity, and each magnet top adjacent the track second side having the first polarity; wherein the axle is pulled along the track up-slope by the magnet pairs to the track peaks, and falls along the track down-slope under the influence of gravity.