I leddfu problem gorlenwi'r trenau, byddwn yn prynu cerbydau ychwanegol o 2019, hynny ar ben y trenau ychwanegol rydym eisoes wedi'u cyhoeddi. Defnyddir y trenau ychwanegol hyn i leddfu'r broblem gorlenwi ac i gyflwyno gwasanaethau newydd. Byddan nhw hefyd yn ein galluogi i gynnal y rhaglen dreigl o welliannau i'r fflyd bresennol er mwyn sicrhau ei bod yn bodloni'r safonau hygyrchedd a ddaw i rym ddechrau 2020. Caiff symbol tanfuddsoddi yng Nghymru, y fflyd Pacer, eu tynnu'n llwyr o'r rhwydwaith erbyn diwedd 2019.
To ease overcrowding, we will be introducing additional rolling stock from 2019, which will be on top of the extra trains that we have already announced. These additional trains will be used to relieve crowding, as well as to introduce new services. They will also provide additional cover to enable the rolling programme of upgrades to much of the existing fleet to ensure it meets the new accessibility standards which come into force at the beginning of 2020.  The symbol of underinvestment in Wales, the Pacer fleet, will be removed entirely from the network by the end of 2019.