They used one of these to dig the new tunnel under Seattle. Know what stopped it dead in it’s tracks? A very old 6 inch diameter cast iron pipe. It was down for several days.
That’s when cast iron was CAST IRON.
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They used one of these to dig the new tunnel under Seattle. Know what stopped it dead in it’s tracks? A very old 6 inch diameter cast iron pipe. It was down for several days.
That’s when cast iron was CAST IRON.