The way you avoid having high G-forces is by accelerating over a longer period of time. These kinds of trains would be used for fast transit between cities that are many hundreds of kilometres apart, not for short hops like a subway. This is precisely why China has different types of trains for different situations.
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G-forces are a product of acceleration, they have nothing to do with speed. Sounds like somebody failed their basic physics in school. 😂
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The way you avoid having high G-forces is by accelerating over a longer period of time. These kinds of trains would be used for fast transit between cities that are many hundreds of kilometres apart, not for short hops like a subway. This is precisely why China has different types of trains for different situations.