Umshini wamandla ochungechunge lwe-F, i-F85 umshini owodwa wokuqina we-Dual station, okungukuthi ukuqeqesha izicubu zesisu nezangemuva emshinini owodwa ofanayo.Ukunyakaza kwe-Back Extension kuhambisana nemisipha eqeqeshwe ngesikhathi sokuzivocavoca kwesisu.