In November 1887, the Metropolitan was merged into the West End Street Railway as it consolidated the various Boston street railways into a unified system. After the successful electrification of the Beacon Street line in 1888–89, the West End quickly moved to electrify its entire system. The Jamaica Plain–Northern Depots line was concerted to electric operation on October 14, 1891, followed by other Tremont Street lines on October 22. The horsecar barn at Jamaica Plain was replaced with a new structure for the electric cars; in early 1901, it was in turn replaced by a carhouse with a passenger waiting room and space for 150 streetcars.