We are trying to choose and wonder what you all would recommend. Not sure yet whether we will do Switzerland->Naples->Rome or Switzerland->Rome->Naples->back to Rome (for last night before flight)
train Wengen to Basel or Zurich and then fly to Rome or Naples (con: 4 adults plus luggage could be around 1000CHF give or take; early evening or night arrival due to timings)
train Wengen to Rome or Naples (via Luzern and Gotthard route) all in one day (11-12 hours on the train in one day...crazy?; arrival in destination after dark)
train Wengen to Lugano (via Gotthard route); stay night in Lugano; train Lugano to Rome or Naples the next day (eats an extra day and requires a hotel night)
In some ways I think the Lugano option is best. In other ways I think the all in one day train journey is best. But is 11-12 hours on a train, ie. the whole day, crazy to consider? There will be a couple of transfers obviously. But train or not, that seems a long time!