on-rail transfer trolleys for wholesales 30t-Perfect 30 ton Coil Transfer Trolley Transport Aluminum Steel Pipe Material. The 30 ton Coil Transfer Trolley is powered by rail.The 30 ton Coil Transfer Trolley can realize full auto operation by PLC system.The 30 ton Coil Transfer Trolley can be applied in the environment such as severe environmenthigh temperature anti-explosive etc. Simple