HO 1216 then EU 6678 at Pudong
Xi'an → Shanghai → Chengdu
Timetable, Shanghai time
19:40HO 1216 from Xi'an at the gate
12:55EU 6678 to Chengdu leaves the gate
17 h 15 apart on the timetable, overnight
EU 6678 leaves 17 h 15 after HO 1216 arrives on the timetable: more than half a day, so not a connection we count.