Cafwyd cefnogaeth lawn Network Rail yn hyn o beth, a gwnaethant weithio'n agos gyda Llywodraeth Cymru i sicrhau bod yr holl arian sy'n cael ei wario ar y cynllun yn sicrhau'r canlyniadau gofynnol.
Welsh Government entered into a contract to deliver the Ebbw Vale frequency enhancement scheme with Network Rail, but took appropriate steps to pause and review it when costs began to escalate.