37 Building construction for rail infrastructure projects; installation, repair, renovation and maintenance of rail and road infrastructures, surfaces and tracks, and road making and railroad construction equipment; installation and maintenance of transportation and traffic equipment and systems, maintenance of rail vehicles for transporting passengers or merchandise, the aforementioned rail vehicles serving towns, suburbs and regions; repair, servicing, maintenance of rolling stock for railroads, namely, locomotives, railroad freight cars, railcars, railroad trains with or without self-propulsion, articulated or non-articulated railroad trains, storage tanks for rail vehicles, rail couplings, motors and engines for vehicles, pneumatic shock absorbers for vehicles, land vehicle transmission belts and gears therefor, vehicle air pumps, drive shafts for land vehicles, brakes for vehicles, bogies, axles for vehicles, shock absorbers for vehicles, electric motors for vehicles; installation, servicing, maintenance and repair of computerized navigation systems, rail traffic safety appliances, namely, technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; installation, servicing, maintenance and repair of computerized navigation systems, rail traffic safety appliances, namely, installation, servicing, maintenance and repair of computerized navigation systems, rail traffic safety appliances, namely, resistance measuring instruments and distance measuring apparatus; installation, servicing, maintenance and repair of computerized navigation systems, rail traffic safety appliances, namely, railway signals; digital signal processors; installation, servicing, maintenance and repair of computerized navigation systems, rail traffic safety appliances, namely, electronic signaling mechanism, namely, a train control system used in the railway industry for detecting and controlling trains, ground faults, broken rails, power failures, track switches and lights, electric and electronic apparatus, fixed or embedded or placed on rail tracks for transmitting data on position and signaling between rail vehicles and control centers for managing and controlling rail and road traffic, rail vehicles and rail signaling equipment, particularly for locating and supervising trains, for securing railroad tracks and train traffic, for traffic control, for planning and managing rail vehicle fleets, for power supply systems for rail vehicles, for computer networks for managing trains based on communication consisting of a central computer and networked communication hubs, computers and computer peripherals, electronic and electrical equipment for processing satellite location data and electronic and electric apparatus for monitoring rail and road traffic, systems for analyzing and diagnosing the condition of rail and road infrastructure equipment, fuel cells, hydrogen fuel cells, electric cells and batteries, road and rail infrastructures, surfaces and tracks; all the aforementioned services in the field of rail vehicles for transporting passengers or merchandise, their infrastructures and equipment