'Sdim stêm yn codi o drên stem Porthmadog - felly ffwrdd a Harri i helpu Owain a gyrrwr y trên. The Steam Train at Porthmadog isn't working. Harri goes to help Owain and the train driver.
3 o fisoedd ar ôl i wylio
14 o funudau
Gweld holl benodau Help Llaw
