3t Shipyard Electric WPerfect Steerable Transfer Carth to pull rail trolley. Brief introduction. • The wPerfect Steerable Transfer Carth is a kind of machine to pull or lift heavy cargoes. • It can be divided into single drum wPerfect Steerable Transfer Carth and double drums wPerfect Steerable Transfer Carth. • Perfectrding to the working speed, it can be divided into high speed electric wPerfect Steerable Transfer Carth and