I plan to take to regular train from Tirano to St. Moritz and stop at Pontressina or Punt Muragl for lunch, then take the Panoramic car from St. Moritz back to Tirano.
My question is, should I buy a regular train ticket from Tirano to either to Pontressina or Punt Muragl, then buy a new regular train ticket to continue my journey to St. Moritz? Or a ticket from Tirano to St. Moritz is good enough that allows me to hop-on-and-off with no time restriction?
Thanks.