CA 1838 then CZ 3223 at Guangzhou
Shanghai Hongqiao → Guangzhou → Yan'an
Timetable, Guangzhou time
14:55CA 1838 from Shanghai Hongqiao at the gate
06:45CZ 3223 to Yan'an leaves the gate
15 h 50 apart on the timetable, overnight
CZ 3223 leaves 15 h 50 after CA 1838 arrives on the timetable: more than half a day, so not a connection we count.