Nov 7, 2019 - 9:56 AM
in reply to tharrit
Hi Tharrit - I completely agree with Rockoyster, as my experience over many years has been that the only really crowded ( hard to find a seat) trains are those going into the large cities during the morning commuter rush. Afternoon outbounds, too, but they seem to be less crowded, possibly because the commutes are being spread out over a longer time frame as people leave work at different times, or do a bit of shopping before they head for home.
Even if the train from the airport is crowded, many people will get off at the stop in Zürich main station, and you can likely move to a different seat.
How many are traveling in your party? If you have several people, you may find that you can not all sit together. One person will have no trouble, even on a Saturday in August. If you want to assure your self of a car that is definitely not full, you can take that trip in first class, by buying a first class ticket, or by paying a surcharge before boarding if you are using a second class Swiss Travel Pass. I would not bother, but it is an option. More expensive than a reservation, though.
I just checked a train meting your description, the 1218 on Aigust 8th, and was surprised to find that occupancy rate was not displayed. Odd. So, I used the advanced search capabillity.
In the advanced search, you can choose to display trains that do not have high occupancy, or allow the display of trains that have high occupancy. I tried both, and got the same trains at 1218. So, that train will not have high occupancy, as far as I can tell. It might be worth a check a few weeks before you travel, if you are really worried.