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Railway sleepers are really a great resource. I used to be able to buy them for around $5 each. Now they're closer to $100! The ones we get are made from Australian jarrah which is I think, Eucalyptus marginata, a very very hard and heavy timber. Now they're also made from Cupressus macrocarpa.
It is not permitted to sell old railway sleepers anymore in the UK: because of the contamination from the oozing Anthony describes and the associated carcinogens.We are told to emphasise this ( the banning of the sale) on the radio programme. Large lumps of untreated wood in the size and shape of railway sleepers are available.... I'm told they are rather expensive.