The project of the self – driving catenary conveyors for unloading and loading propane – butane gas cylinders was the authorial concept of the ALMA company owner – Aleksander Lydek. The order included the following phases: concept, design, production and assembly of the machine. The uniqueness of the driving catenary conveyors is connected with their construction and adaptation in the whole infrastructure. The lower element moves inside the conveyor mounted into the floor, the another one transports cylinders on height of the back of the truck. An operator can manipulate the driving catenary conveyor. The machine works in the explosion threat zone and therefore it was produced with due precision using the EX technology.