Having a consistent pressure (fully tunnel or fully open air) might help, as the shinkansen needs the very long-nosed trains to help with the ‘pop’ entering or leaving a tunnel.
However that could also be alleviated with the concrete tubes at the end of each tunnel that gradually get more enclosed
@perviouslyiner@fearout The *ORIGINAL* concept was a low pressure tube with a train in. If this could be done it could reach aviation speeds. I make no comment on how low the pressure would need to be for say 700mph, but this is *hard*.
However, as a comment early on in the link explains, nobody has built one because it’s hard. Billionnaires who get interested in this end up building very short train lines. Elon Musk’s Hyperloop is a system of trucks that carry cars, which is just a ridiculous idea.
@perviouslyiner@fearout IMHO there is no good reason for people to travel at more than 300mph or so. There are no sustainable ways to do so with current technology, and the fastest way to cut aviation emissions is to stop flying. Flying is much too cheap given the harm it causes, and public transport is too expensive given how efficient ecologically it is.
That does mean much less travel between America and Europe. But so what? You can holiday closer to home. If your relatives moved several thousand miles away, they probably don’t want to see you anyway. 😀
Having a consistent pressure (fully tunnel or fully open air) might help, as the shinkansen needs the very long-nosed trains to help with the ‘pop’ entering or leaving a tunnel.
However that could also be alleviated with the concrete tubes at the end of each tunnel that gradually get more enclosed
@perviouslyiner @fearout The *ORIGINAL* concept was a low pressure tube with a train in. If this could be done it could reach aviation speeds. I make no comment on how low the pressure would need to be for say 700mph, but this is *hard*.
However, as a comment early on in the link explains, nobody has built one because it’s hard. Billionnaires who get interested in this end up building very short train lines. Elon Musk’s Hyperloop is a system of trucks that carry cars, which is just a ridiculous idea.
Having said that, we need more trains.
@perviouslyiner @fearout IMHO there is no good reason for people to travel at more than 300mph or so. There are no sustainable ways to do so with current technology, and the fastest way to cut aviation emissions is to stop flying. Flying is much too cheap given the harm it causes, and public transport is too expensive given how efficient ecologically it is.
That does mean much less travel between America and Europe. But so what? You can holiday closer to home. If your relatives moved several thousand miles away, they probably don’t want to see you anyway. 😀