Menter gan Lywodraeth Cymru yn bennaf oedd prosiect Atgyfnerthu Rheilffyrdd y Cymoedd a'i nod oedd sicrhau gwell gwasanaethau ar goridorau rheilffordd allweddol (Glynebwy yn bennaf) sy'n cysylltu'r Cymoedd â Chaerdydd. Cyfanswm cost y prosiect oedd £22,674,978, a derbyniwyd grant gwerth £8,478,945 gan Gronfa Datblygu Rhanbarthol Ewrop.  Dechreuodd y gwaith ar y prosiect ar 1 Ebrill 2008 a daeth i ben ar 30 Ebrill 2011.
The VRS was principally a Welsh Government initiative intended to support enhanced services on key rail corridors (most notably Ebbw Vale) linking the Valleys with Cardiff. The total project cost was £22,674,978, including £8,478,945 European Regional Development Fund grant monies. The project ran from 1st April 2008 to 30th April 2011.