Apr 26, 2018 - 7:01 AM
in reply to Minal
You mean 16:38 and 9:23.
As per my previous post you can go Luzern - Lugano - Luzern in one day but you can't, nor should you want to, take the GPEX in both directions on one day.
You just need to decide whether you want to take early morning train to Lugano and start GPEX there at 9:23. Or take GPEX from Luzern to Lugano and catch a fast train departing after 16:38 back to Luzern.
If there is not a GPEX departure time that appeals to you you can still cover the same route using regular trains and boats. Check the SBB Timetable.