CYCLIC TOP! Near UK Train Derailment, Freight Train bounces out of control.

66304's consist nearly derails passing over wet beds, where a double dip in the track causes the connected wagons to bend and shake all over the place! I honestly thought it was about to come off the track. Reported to the signaller as soon as the train has passed. This was the root cause of the derailment near Lydney on the same type of wagons, thankfully it stayed on this time! Seen is 66304 on 4M36 Daventry - Wentloog at Moreton-On-Lugg 09/03/2014.