The tour books one entire train car, if the tour is full then all seats are taken and its hard to get views on the other side.
You would be better to rent a car and drive to the train, and then book your own ticket.
When I looked online it showed no tickets available, but at the station you could buy a 1st or 2nd class round trip and come back to the car for cheaper than the tour cost.

The bus trip left Milan at 7:00am and nothing was open to get breakfast or coffee. At the bus stop there were 150 of us with 30 minutes to try to get a coffee or food and use the bathroom. Since there were NO Bathrooms on the bus we went without anything to eat. Really poor planning on Viator's part.

Wonderful tour, my pictures look like postcards, enjoyed every minute of it. Congrats to Angelo the driver for his profissionalism. This tour it’s a must.

You take a long bus ride to Tirano. Have option to pay for meal or on own. We did the meal which is just ok. Went to train station and that’s when we were finally told we will only be on train for a few stops “due to possible weather”. Only 3 stops on train and then wait at a small terminal in Poschiavo to wait for the bus that takes you to see “snow” and say you made it to Switzerland. Stopped for a 10min photo opp. No St Moritz, no chocolate. Back on bus and stopped at 2 gas stations. A complete waste of a vacation day and money. Received a small refund. They knew as we boarded bus in the morning but no options offered. Poorly handled and deserve full refund. Buyer beware! They don’t stand by the trip when it doesn’t go as published!

The only reason I didnt give it one more star was due to our tour guide. Thankfully the trip itself acted as a guide, as the views were incredible. Our guides English wasnt very good and she did not communicate very well, she also didnt seem that organized. We also found the initial boarding process very chaotic. On at least two occasions during the tour she started walking before we all were off the bus well out of range of our radios and we had to try and find her to catch up. The information she chose to share throughout the entire trip wasnt very informative and I would say almost half of the people on our tour ended up taking out the earpiece and just let the landscapes be the tour guide. All in all a terrific experience and would highly recommend.

The journey would have been better if there was only one stop To have more time at St Moritz Once there I was not able to really enjoy its beauty nor have a beer because the time allotted was less I felt rushed while there. Even though someOf the shops are closed Sitting and drinking and enjoying the beauty would have been an awesome moment ... Was a little disappointed

The views were spectacular, the guides were friendly, and we would recommend this tour to our friends and family.

I signed up for the English and Spanish version of this tour since the English only was not available. The English guide, Boris, struggled with the language. The Spanish guide, however, was wonderful, giving plenty of information that the English guide did not. Being bilingual, I was able to enjoy the Spanish narration but I felt bad for my husband as he did not understand the Spanish as I did. There should be a script for this kind of tour so that both languages say the same thing! The pick up for this tour is at the Milan Visitor's Center at 7 am so my husband and I were there early and luckily there is a coffee shop across the street that opened at 6 so we were able to enjoy a cappuccino while we waited. At the end of the tour, we were dropped off at about 8:30 pm with vague directions on where to find a taxi. HERE IS THE TRICK TO GET A TAXI AFTER THIS TOUR: if you wait at the taxi stand, it will take forever to get a taxi but if you walk into one of the numerous restaurants and have dinner, you can request that they call a taxi for you after dinner! This worked great for us as we were getting really frustrated waiting at the taxi stand in a country where we don't speak the language. Concerning the tour, you take the bus to Tirano and then the train to St. Moritz, but the way back from St. Moritz is all by bus. Also, there is A LOT of walking in St. Moritz and not a lot of time. We walked at least 20 minutes or more to get into town to search for a coffee shop and we only had a few minutes before we had to begin to walk back. Still, even with all these issues, I would sign up for this trip again as the views of the Alps were AMAZING.

Very nice - Big down side you do not get enough time in st. Moretiz Switzerland. We went on a Sunday Shops were closed and we had time to visit one chocolate place before we had to run like crazy not to miss the bus back

Everything went very smoothly. Excellent driver and guide. Spectacular panoramas and the Church of Tirano. Breathless views of the Alps.I highly recommend this tour.