Yn y Gogledd, yn 2013, cytunodd Llywodraeth Cymru i ddarparu £44 miliwn o gyllid i Brosiect Lleihau'r Amser Teithio rhwng Gogledd a De Cymru, gyda'r gobaith y byddai'n cael ei gwblhau gan Network Rail ym mis Chwefror 2015. Mae'r prosiect wedi wynebu nifer o rwystrau, a hynny oherwydd methiant Network Rail i gynllunio, sydd wedi arwain at oedi'r prosiect, lleihau ei gwmpas, a chynyddu'r gost o'i gyflawni.
In North Wales, in  2013, the Welsh Government agreed to provide £44 million of funding for the North to South Wales Journey Time Reduction Project which was scheduled to be completed by Network Rail in February 2015.  The project has been blighted by a number of set-backs, which have been caused by Network Rail’s failure to plan, and which have led to a reduction in scope, an increase in cost and a delay in delivery of the project.