Mae Llywodraeth Cymru’n disgwyl i’r Achos Busnes Llawn ddod i law ym mis Ionawr 2017, gyda’r nod o weld y gwaith yn cael ei gwblhau yn ystod y flwyddyn ariannol nesaf.
The Welsh Government expects to receive the Full Business Case in January 2017 with a view to works being completed during the next financial year.