The Renfe Class 730 or S-730[5] (Spanish: Serie 730 de Renfe, manufacturer's designation Talgo 250 Dual) is a push-pull high-speed dual-gauge, dual-voltage and hybrid (electric and diesel) trainset consisting of 9 Talgo VII tilting coaches, two intermediate diesel-generator cars and two head electric power cars, used on Alvia services.

[8] They are a variant of RENFE Class 130 modified to be able to run on both electric and diesel power, in order to extend higher-quality services to parts of Spain not on the electrified network.

[9] The carriages are constructed from aluminium and incorporate the Talgo Pendular passive pendulum tilting system,[10] are sealed against pressure differences for tunnel travel,[1] and have underframe air conditioning, individual audio systems and video displays, rotating and reclining seats and power outlets.

[11] On 24 July 2013 a Renfe Class S730[12] running as the Alvia 4155 service from Madrid to Ferrol derailed in north-western Spain, killing 79, out of 218 passengers on board.

The cause of the accident is not yet officially determined, but the train was alleged to be traveling over twice the posted speed limit while entering a curve, due to the absence of European Rail Traffic Management System (ERTMS).