Did the East India Company commission actual ships of the line?
Short answerSome very large East Indiamen converted readily into fourth rates, and one may have approached third-rate status. That makes the answer a qualified one: a convertible merchant hull was not already a fully equipped ship of the line.
NotesPurpose-built battlefleet warships differed from the company's unusually large armed merchantmen. Their ability to become Royal Navy fourth rates shows how substantial the hulls could be, but it does not make their commercial configuration equivalent to a commissioned ship of the line. Conversion required a much larger crew and a heavier lower-deck armament than the ships carried in trade. The distinction separates a hull's structural potential from the fighting system installed inside it.