<prompt> Yakha inguqulo eyinkimbinkimbi yalesi sigwebo Izitimela zeClass 800 zaqala ukusebenza kuGreat Western Main Line ngo-16 Okthoba 2017.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi Izitimela ze-Class 800 zaqala ukusebenza ku-Great Western Main Line ngo-16 Okthoba 2017, futhi zizosebenza ku-East Coast Main Line kusukela ngoDisemba 2018. 