Mae’n dilyn cytundeb tymor byr cychwynnol gwerth £40m a gadarnhawyd ym mis Mawrth, gan fynd â chyfanswm y gost i uchafswm o £105m (yn amodol ar lefelau refeniw teithwyr).
It follows an initial short-term agreement worth £40 million which was confirmed in March, taking the total cost to a maximum of £105 million (subject to levels of passenger revenue).