Gwynedd Cerdyn Cymru passholders will be eligible for free travel on the Cambrian Coast, between Machynlleth and Pwllhelli, with some restrictions on busy school trains.
Bydd y rheini sydd â phas Cerdyn Cymru Gwynedd yn gymwys i deithio am ddim ar lein Arfordir y Cambrian , rhwng Machynlleth a Phwllheli, er bod rhai cyfyngiadau ar drenau ysgol prysur.