Abstract: A dual-mode transportation system comprises a monotube guideway along which a dual-mode vehicle travels in a first mode of operation, the dual-mode vehicle having a second mode of operation in which it travels along a roadway. Each dual-mode vehicle carries its own four-wheel dolly for engaging the guideway as the vehicle travels along the guideway, the dolly being retractable so as to be stored in a recess in the roof of the vehicle. The dolly carries a flexible pick-up element which extends to an electric supply line in the guideway so as to receive and provide to the vehicle centrally generated power provided by the electric supply line. Power received by the vehicle during travel along the guideway is used not only to motivate the vehicle along the guideway but also to recharge a battery which powers the vehicle during conventional roadway travel.