Oct 12, 2011 - 1:21 PM
Hi Christine,
Depending on where you purchase, the pass can be validated by yourself, or it needs to be done by railway personnel. In the latter case, I'm not 100% sure if it can be done if you can't present the passports of all travelers. However, Geneva and Geneva airport are just a few minutes apart, so if your friends can't validate it at the airport, they can buy tickets to Geneva for a few francs and validate it there.