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The long nose on the bullet trains is there to help reduce the shock load when they enter a tunnel.
Trains are very long when compared to road-going vehicle. Even double semis don't hold a candle to them. When you get a form that's that long, things get a bit disrupted just do to the skin drag along the sides. The boundary layer towards the end is so thick that a boat tail does little to nothing to help.
Hope that helps.
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