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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
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