I intend to buy a lake Geneva regional pass. Can I buy train tickets online on sbb site for the discounted days. Would I buy half fare tickets?
Welcome to MySwissAlps! You don't need tickets for the free travel days. Indeed you do need half fare tickets for the other days. Please find this explained here: www.myswissalps.com/re gionalpasslakegeneva/h owtouse.
It does not matter whether you buy these tickets from SBB, or at the station, or from any of the other ticket websites: www.myswissalps.com/tr aintickets/switzerland halffare/price. Note that a few (cable car) routes offer a different discount than 50%, so you can best buy those tickets on the spot: www.myswissalps.com/re gionalpasslakegeneva/v alidity.
Enjoy your trips!