W4 6315 then FR 3140 at Barcelona
Milan → Barcelona → Luxembourg
Timetable, Barcelona time
12:25W4 6315 from Milan at the gate
06:25FR 3140 to Luxembourg leaves the gate
18 h apart on the timetable, overnight
FR 3140 leaves 18 h after W4 6315 arrives on the timetable: more than half a day, so not a connection we count.