Acumulador_de_Carga_Rápida
Acumulador de Carga Rápida
Battery electric tram system from Spain
Acumulador de Carga Rápida (ACR) (transl. fast-charging battery) is a battery electric tram system marketed by Construcciones y Auxiliar de Ferrocarriles (CAF) of Spain. Trams equipped with ACR are fast-charged while at stops; elsewhere they require no overhead line, which is desirable for reasons of safety, reliability, cost, and aesthetics.[1][2] It also allows regenerative braking where direct current electrification systems cannot return (much) energy to the grid.[citation needed]