Mae'r trenau'n rhan o fuddsoddiad o £5 miliwn mae Trafnidiaeth Cymru yn ei wneud ledled Cymru â'r Gororau, a disgwylir i'r rhai cyntaf ddechrau cael eu defnyddio yng Ngogledd Cymru yn ystod 2019.
The trains are part of the £5 billion investment being made by Transport for Wales across Wales and the Borders and are expected to go into service first, in North Wales, during 2019.