{{Infobox train | name = Renfe Class 120/121 | image = Alvia_120-861_Madrid-Hendaya.jpg | caption = Renfe 120-6051 at Valladolid - Campo Grande (Valladolid) | interiorimage = | interiorcaption = | service = | manufacturer = CAF / Alstom | factory = | family = | replaced = | yearconstruction = 2001 (order date) 12 units2004 (order date) 45 units | yearservice = | refurbishment = | yearscrapped = | numberconstruction = | numberbuilt = | numberservice = | numberpreserved = | numberscrapped = | formation = 4-car setsMCT-MIT-MIP-MCP (120)Mc-M-M-Mc (121) | fleetnumbers = | capacity = Class 120: 237 (+1 reserved)Class 121: 280 (+2) | operator = Renfe | depots = | lines = | carbody = Aluminium | trainlength = | carlength = (end cars) (intermediate cars) | width = | height = | floorheight = | platformheight = | entrylevelorstep = | doors = 1 per side | maxspeed = | weight = empty) 29 units of the class Renfe Class 121 were ordered for medium-distance high-speed Avant services. The units are very similar to the Class 120 but include additional electrical equipment for redundancy (a requirement for trains using the Guadarrama Tunnel), and do not provide first class seating, raising the number of seats to 282. Design Class 120 The trainsets are 4-unit multiple units capable of operating in pairs, designed for medium-distance high-speed services. The inner axle of each carriage bogie is powered by a body mounted three phase asynchronous traction motor via a cardan shaft final drive. The motors are driven by IGBT converters with one converter per carriage. The bogies are of welded steel construction with primary coil springs and secondary air suspension. Tractive forces are transmitted by a drag pivot pin. The bogies incorporate CAF's BRAVA (Bogie de Rodadura de Ancho Variable Autopropulsado) system which allows gauge-changing without stopping and operating speeds of up to The maximum axleload is . The vehicles are air conditioned with one toilet per car. Passenger services include individual audio systems, and audio and visual information systems. One seat is reserved for disabled passengers, and wheelchair ramps are fitted. The driver's cab is also air conditioned, and the train is equipped with GSM-R systems. There are 156 seats in 'standard' accommodation and 82 seats in 'first class'. Class 121 The 121 class are built to the same design as the original 120 Class but have additional electrical equipment