Actually, the real situation isn't quite this simple because the Earth is not a sphere of uniform density. For other bodies of the solar system, planets, satellites, and even the Sun itself, a one way fall-through time along a diameter remains within a factor of two of the same 43 minutes. And so on. I therefore won't discuss these further, except to say that the experimental search for both goes on at many laboratories, but as yet there is no evidence for the existence of either. Let me then turn to shadow matter, which is more hypothetical than the other two classes of invisible particles, but which is also of more potential interest to readers and writers of science fiction.
Shadow matter is predicted by some variants of superstring theories.
The vehicle would fall through the Earth's gravity well, emerging at a diametrically opposite point on the planet 38 minutes later. There it might, as it entered the subway station, be converted back to normal matter. Getting into space would be much easier and cheaper with this technology also. No elaborate launch facilities would be needed. A space vehicle could be converted to shadow matter inside a building, and it would then plunge directly toward the center of the Earth.