Hi chandduggal
The SwissTravel Pass is only a data holder, not a valid travelcard. If you have a GA, day pass, saver day pass, you can travel to Feldkirch on bus line 12 & 14 at no additional cost. However, only by bus, not by trains!
The Half-Fare Card can also be considered for the purchase of tickets for this connection.
Otherwise, you will have to buy international tickets when travelling by train. For more information, please call 0041 848 44 66 88 (CHF 0.08/min). If you are calling from abroad and this number does not work, please try 0041 51 225 78 00.
Have a nice day. EllenvS.