Aug 22, 2017 - 3:01 AM
in reply to CatherineC
Further to rockoyster's suggestion of taking the scenic Centovalli Express from Locarno to Domodossola, you have two choices from Domodossola to Visp.
The most scenic route is to take the PostBus over the Simplon Pass from Domodossola to Brig, then train to Visp. Alternatively, you can take a train through the Simplon Tunnel, but will miss the scenery of course. No reservations are required on the PostBus.
If you are interested, you can read about my experience on the Centovalli Express and PostBus over the Simplon Pass under the heading Saas-Fee to Locarno on the page below. There are also some photos of the Simplon Pass sector.