Yn syth ar ôl clywed am golli’r pŵer i’r cyfarpar signalau, aethpwyd ati i gaffael generadur arall o Orsaf Bwmpio Sudbrook (Twnnel Hafren). Roedd y signalau wedi’u hadfer yn llawn erbyn 10:00, rhyw deirawr ar ôl i’r methiant gael ei gofnodi gyntaf.
Immediately after the loss of power to the signalling equipment was first reported, a replacement generator was procured from Sudbrook Pumping Station (Severn Tunnel). Full signalling was restored by 10:00, approximately three hours after the failure was first reported.