be identical car 100 is depicted with a number of sets of wheels for example a set of two driving wheels 102 is illustrated to engage with the ground it is contemplated that a total of eight driving wheels 102 may be provided at the corners of car 100 in a tandem arrangement in this manner not only is the weight carrying capacity increased but in case one of the tires bursts an additional wheel is provided to carry car 100 until car 100 can come to a stop for replacement of the damaged driving wheel 102 it is further contemplated that while eight driving wheels 102 are selected for an advantageous embodiment any number of driving wheels 102 may be selected depending upon the application for example for relatively heavy freight applications it may be desirable to provide car 100 with sixteen driving wheels for bearing the additional weight the tires may be designed for normal operation up to for example 200 mph with a normal load of 8 000 lb so that a freight car at 32 tons fully loaded conforms on the street to the usual limit of 16 000 lbs per axle additionally on the street the tires must deflate automatically to avoid damage to warm asphalt in the summer in still another advantageous embodiment the driving wheels 102 provide all wheel steering while on the track 200 fig2 the steering provided by driving wheels 102 is nominal however for street applications the steering of driving wheels 102 is the primary means for steering.