the scope of the claims for example it should be understood that no more than two rails are necessary what is important is that the rails form a parallelogram projection having two sides parallel to the desired orientation plane the invention can be understood as two parallel ramps one forward and one rear separated by the wheelbase of a vehicle and so arranged that the vehicle can simultaneously engage the front ramp with its front wheels and the rear ramp with its rear wheels in this regard rails might be replaced with ramps that are slotted or otherwise constructed so as not to interfere with the desired vehicle path it is also envisioned that overhead rails could be used it should also be understood that for clarity the rails have been presented as beams it is expected that trusswork and cross bracing would be appropriate in many situations in fact the system could be made to be self supporting and portable it is also envisioned that safety railings could be added without interfering with the rails rail pairs might be joined with planking grilles lattices or similar cross bracing to form a ramp surface for non rail passage it should be understood that rails might have a channeled grooved crowned or flat cross section as necessary to better engage the wheels and that other terms such as tracks guides beams and members would be similarly applicable when describing the rails although a self propelled vehicle 102 is preferred it is easily envisioned that an external propulsion unit such as a winch could be employed the vehicle 102 might be free to travel both on and off the rails or might be constrained to the rails at one or both sites the vehicle.