You can, but it will cost ~$120-150 if I recall correctly, so unless you're making several trips it's rarely worth it. They do have a 'secret' ticket called a

You can, but it will cost ~$120-150 if I recall correctly, so unless you're making several trips it's rarely worth it. They do have a 'secret' ticket called a Swiss Transfer ticket which will take you from any airport to any train station and back for a much cheaper price than a normal train ticket. However you cannot buy it in Switzerland, but have to order online before your departure.