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Could it have been dry sand for use on the railways for adhesion purposes. I guess the Iron Mink would be the most waterproof wagon available on the GWR. I know the Iron Minks were used mainly for moving explosives - could that be the significance of the white cross?
I have a vague memory of Iron Minks still being used for gunpowder traffic to and from Penrhyndeudraeth on the Cambrian Coast line in the mid-1970s.
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