6E 864 then SG 553 at Mumbai
New Delhi → Mumbai → Gorakhpur
Timetable, Mumbai time
18:006E 864 from New Delhi at the gate
17:15SG 553 to Gorakhpur leaves the gate
23 h 15 apart on the timetable, overnight
SG 553 leaves 23 h 15 after 6E 864 arrives on the timetable: more than half a day, so not a connection we count.