use the engine s can be air driven with no indoor fossil fuel emissions it is common for factories and even warehouses to have built into their system an air compressor with a network of outlets throughout the building transportation carts can be built that have a choice from one to four engines one in each wheel per cart when being used to transport human cargo one engine can economically be used if transporting components of weight two or more can be engaged to carry the load the same cart becomes highly efficient and quickly and easily u201c refueled u201d for multiple uses each parking area for a cart would have a u201c quick connect u201d air outlet which would allow a u201c recharge u201d of the cart during its stay in that location although a battery recharge can take hours air recharges are quick and take seconds to minutes at most as most drives through a factory or warehouse usually involve only a few minutes at most the storage tanks and volumes required to be stored for ideal use of a cart would be lower pressure and small the fuel and emissions would be u201c clean air in clean air out u201d the rotary cam radial steam or fluid powered engine 10 shown in the drawings and described in detail herein disclosed arrangements of elements of particular construction and configuration for illustrating preferred embodiments of structure and method of operation of the present application it is to be understood however that elements of different construction and configuration and other arrangements thereof other than those illustrated and described may be employed for providing a rotary cam radial steam engine 10 in accordance with the spirit of this disclosure and.