It would could take 40+ years to construct and several TRILLION (xx,000,000,000,000) in today's costs, forget inflation, forget going to Mars, etc.
For circa 2005, I'm gonna say hype. Technically anything can be built with enough investment and belief in the project, but in this case they'd have to be crazy. Unless those investors are able to conivince any government affected by such a route to help fund such a project, it is not going to go beyond a simulation. I guaranetee and airline or aircraft company will lobby against such a project is they had enough influence within their respective governments.
That said, noting the size of the Atlantic, IMO, 600mph is not enough. We might as well spare no expense and have it be supersonic or better in a partial vaccum tube. Now that is crazy, why? Imagine how long it would take to evacuate even 90% of the air from a tube 30 feet wide and 15 million feet long...unless it were in sections with multiple pumps, while the tunnel is being built.
Operation would be like moving through a canal, except the route is one giant channel lock. After the train is boarded, it moves into a sealed chamber that depressurizes and a door opens in front and the sucker takeoff. As it approaches the other end it slows into another chamber that resets the pressure such that the train enters ambient pressure to begin unloading.
The micro pressure of the tunnel may allow a maglev to be powered by a two rocket motors with one at each engine, dual purpose and no fuel spent in between, or at least minimal. I think most of the time spent will be in the pressure differential chambers. To be efficient, all electrical power should come from geothermal stations below each tunnel break connected to the seafloor. Yeah, I'm having fun with this thread, been bored all summer break so far.
I'm guessing total time for a round trip being on the order of 4-5 hours for a train of length 1 kilometer with 2500 people aboard. Engines may require two space-shuttle-type-rockets to burn for 10 minutes to accelerate to a groundspeed eqivalent of M3
. If the reverse engines do not fire I think for emergency the train will land on tracks and use its own knetic energy to power electro magnetic brakes for an emergency stop. Will it be enough? I donno, I haven't done the math yet, ya'll read pure brain barf.
Hold on, lemme do it up'n I'll get back to ya.
The meaning of life is curiosity; we were put on this planet to explore opportunities.