Er diogelwch, cafodd y cerbydau yr effeithiwyd arnynt eu tynnu o'r gwasanaeth ar unwaith, sefydlwyd Trefn Reoli Arian gan Drenau Arriva Cymru a Network Rail, cafodd y gwasanaethau arferol eu cwtogi, a defnyddiwyd trenau profi i weld achos y difrod i'r olwynion ar hyd y rheilffyrdd ble y digwyddodd y difrod o bosibl - yn bennaf rhwng Caer, yr Amwythig a Chaerdydd.  Roedd y lleoliadau posibl hyn yn cynnwys pwyntiau newid traciau, croesfannau, cyfleusterau depo a seilwaith eraill. Roedd Llywodraeth Cymru yn derbyn y newyddion diweddaraf bob hanner awr. Rwyf wedi rhoi y newyddion diweddaraf ar y cyfryngau cymdeithasol drwy gydol y cyfnod.
As an immediate safety precaution affected vehicles were taken out of service, a joint Silver Command Control was established by ATW and Network Rail, normal services were truncated, and test trains were despatched to check all potential causes of wheel set damage along the routes where damage may have occurred - principally between Chester, Shrewsbury and Cardiff. These potential locations included points, level crossings, depot facilities and other infrastructure. Welsh Government received half-hourly updates. I have provided regular social media updates throughout.