Thing is, even at 30kts the Hamburg-New York run takes five days and bad weather can easily make it six.
In comparison it takes about eight hours to fly the same route. A lot less if they take the Concorde.
The only way to get people to take the boat in this case is if it's extremely cheap (It won't be but more on that later) or if it's a cruise.
If you make it a cruise ship then you'll have to loose the mixed cargo capability since cruise guests aren't going to want to visit any freight terminals. (Especially not in the 70ies New York)
She's not going to be cheap either. This has nothing to do with her nuclear propulsion, it's because she carries passengers.
The problem is that passengers needs a lot of crew to look after them (About two for every five passengers on contemporary long haul ferries)
Unfortunately this number doesn't scale well. The fewer passengers you have the more crew you need per passengers.
So you'll need a significantly larger crew in order to carry a meaningful number of passengers. And that's not even considering the crew. By the 1970ies even the largest diesel ships had engine crews of less than twenty people.
Maersk triple E class with Nuclear propulsion equals big profits for the GTC.
Hard to say really. There's only ever been four nuclear merchants, of which only one was ever truly in commercial service, so the operational costs have never been fully mapped out. One question in particular that hasn't been answered is what effect would wide scale adoption of nuclear power have on the supply situation? Will supply be able to keep up with demand? Fuel grade uranium is not exactly easy to extract.
(I'm aware of the soviet ice breakers, but they operate in an entirely different economical and physical environment)
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