Meaning of the phrase “significant practical problems” in this context “After the invention of the railway, much thought was given to building a rail tunnel, but as early trains were pulled by steam-powered locomotives there were significant practical problems with this idea, as well as the continuing fear that such a channel could be used for hostile invasions of both countries.”
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Significant practical problems could be caused as the early locomotives were steam-powered and hence getting them through tunnels would have cased the issue of how to allow the smoke to ventilate and for the same reasons early tunnels were never long so that the people riding in the rail would not have to face any medical problems or suffocation.
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