The s-730 dual train ran its maiden route in June 2012 from Madrid to Galicia. It is the company's first hybrid train, with both diesel and electrical traction technology enabling the advantages of high-speed travel to be extended to non-electrified legs thanks to its rolling systems allowing it to travel on UIC- (AVE gauge) and conventional-gauge tracks.
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.