CA 1280 then CA 1211 at Beijing
Yan'an → Beijing → Urumqi
Timetable, Beijing time
13:15CA 1280 from Yan'an at the gate
11:05CA 1211 to Urumqi leaves the gate
21 h 50 apart on the timetable, overnight
CA 1211 leaves 21 h 50 after CA 1280 arrives on the timetable: more than half a day, so not a connection we count.