Passengers inside an aeroplane, that is going through a free fall can feel the effect and if the fall is fast enough, they could even be levitated inside the plane. The same effect goes with a free falling elevator.

But passengers inside a bullet train feels no significant changes even though the speed of a bullet train is faster than that of a free-falling elevator.

Is there any explanation for this?

I herd that are people that are trying to build a space elevator, but is there a tether strong enough to take the strain of a space station on the other end of the tether ?