Wedi i'r tywydd wella, ac i'r gwaith mawr o glirio'r traciau a phrofi'r rheilffyrdd gael ei gwblhau, cafwyd gwelliant graddol yn y gwasanaethau ar y 3ydd a'r 4ydd o Fawrth, a daethpwyd o hyd i'r seilwaith oedd wedi achosi'r difrod i'r olwyn yng Nghyffordd Gorllewin Maendy, ger Casnewydd.   Diolch i ymdrechion staff Trenau Arriva Cymru a Network Rail, mae trenau pellter maith yn rhedeg fel arfer o'r 5ed o Fawrth, gydag ychydig o drenau yn rhedeg ar deithiau byrrach na'r arfer o ganlyniad i'r difrod i'r olwynion. Cafodd gwasanaethau lleol ar reilffyrdd Calon Cymru a Dyffryn Conwy ei effeithio ar y 5ed o Fawrth oherwydd ôl-effaith y tywydd mawr, felly parhaodd bysiau i gael eu defnyddio ar hyd y llwybrau hynny, er ddylai rheilffordd Dyffryn Conwy dychwelyd i'w hamserlen arferol ar y 6ed o Fawrth.
Following improvements to the weather, extensive track clearance and route proving, there was a gradual improvement of services on 3 and 4 March and the infrastructure believed to have caused the wheel damage was located at Maindee West Junction, near Newport.   Thanks to the efforts of the staff of both ATW and Network Rail, long distance train services are running as normal from 5 March, with just a few trains running in shorter formations than usual as a result of  the wheel damage issue. Local services on the Heart of Wales and Conwy Valley lines were affected on 5 March by the after effects of the weather, so bus replacement services remained in operation on those routes, although the Conwy Valley line is scheduled to return to normal on 6 March.