Acumulador de Carga Rápida

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. It also allows regenerative braking where direct current electrification systems cannot return (much) energy to the grid.

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