I know DVR used to have the odd charter, but that stopped years before the line was closed to the city.
Incorrect. DVR tried for years to crack into the tightly controlled cruise ship market, without success until 2005. As soon as DVR finally got the rights to access cruise ships, P.N. did its dummy spit with the state Govt over track maintenance (P.N. didn't want to do any) and with excuses about 'liability' pulled DVR's access to the D.V. Line just before the first cruise ship charter ran. So no, DVR never got to run any cruise ship charters. Got the long wished for access to cruise ships only to lose track access in one big foul swoop.
Cruise ships even more now, than before, figure highly in DVR's long range business plan forecasts.