The current collecting member 4 is pivotally carried by a carrier 1 which resiliently urged upward in a bore 6 in a current-collector tube 2 which is telescopically received in an extension tube 3 to an extent which is adjustable by a rack and pinion arrangement 10, 11, 12, 13. The extension tube 3 itself may be extended and retracted by a rack and pinion drive 23-26 to enable the current collector assembly to be withdrawn beneath a sliding roof 18. The construction is suitable for high travelling speeds, high contact- wire levels and considerable contact- wire level differences. <IMAGE>
