Romans used sealed aquaducts to span valleys too large for raised aquaducts.
posted by newtboy 5 years 7 months 1 week ago • 1,045 views • 1:36search results matching tag: uphill
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James May explains why trains can't go uphill very well (unless it's a cog railway of course :) )
posted by blackfox42 6 years 9 months 4 weeks ago • 1,037 views • 5:04- 1