By the end of this year I expect a more detailed report on the potential service timetable and rolling stock options, coupled with further work on the infrastructure costs from Network Rail.
Erbyn diwedd y flwyddyn, rwy'n disgwyl adroddiad manylach gan Network Rail ar amserlen y gwasanaethau a'r opsiynau o ran cerbydau, ynghyd â gwaith pellach ar gostau'r isadeiledd.