The new 730 series trains are the result of adapting 130 series units, which now have added diesel traction units, two 1,800 kw engines with an alternator and a current rectifier. Renfe, through its industrial division Integria, is running a railway engineering and innovation project involving the manufacturers Talgo and Bombardier, which will produce a fleet of fifteen hybrid trains for an investment of 78 million euros.
The new carriages housing the diesel engines also include cooling towers, converters for auxiliary train services, 2,000-litre fuel tanks, and double-axle, variable-gauge bogies for network switching.
The S-730 trains have 216 seats in Clase Turista (standard class), 46 seats in Clase Preferente (first class), one of which is for PMR, and a buffet car.
They can run at a maximum speed of 250 km/h on Alta Velocidad (high-speed) tracks and 220 km/h on conventional electrified tracks, while their maximum speed for non-electrified conventional tracks is 180 km/h. Their signalling systems (ERTMS, LZB and ASFA Digital) guarantee interoperability throughout the Spanish rail network and complete the technical features of one of the most versatile Alta Velocidad (high-speed) trains in the world.