It is debatable in some cases as to what is original as often machines have parts replace during their working life. so with a steam engine little of the original may be left. As the cost of repairing old engines increases as few 'complete' engines exist it has become economically viable to build a new machine from parts based on the old designs and using castings from patterns originally created (in a lot of cases) to replace broken or worn out parts on old machines.
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