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Arco is a commercial passenger train service operated in Spain by Renfe Operadora. Arco fully renovates and refurbishes Renfe's B11x-10200 series of passenger trains. New bogies, capable of working at 220 km/h, were added. The bogies are modified versions of model GC-1 by CAF, also known as GC-3, allowing a higher degree of comfort at higher speeds.