W4 6018 then FR 4891 at Fiumicino
Barcelona → Rome → Catania
Timetable, Rome time
11:40W4 6018 from Barcelona at the gate
11:35FR 4891 to Catania leaves the gate
23 h 55 apart on the timetable, overnight
FR 4891 leaves 23 h 55 after W4 6018 arrives on the timetable: more than half a day, so not a connection we count.