The story is that they could not find bed rock with the piles so they put wool bales down the pile holes.
I have read that there was a problem with one of the piers(which led to the ultimate demise) but nothing relating to the wool bale story.
I was an apprentice at cardiff loco workshops in the 1960's and spent some time in the drawing office.
It was there that I met Ron Preston(noted railway historian) and it was he who told the story.
Ron was a very knowledgible person with a great sense of humour and a colourful story teller.
Was I young(17yrs) and naive and this one of Ron's many tall tales, or was it fact?
Is there anyone out there who can verify (or otherwise) this story.