Gravity Trains. These journeys, by gravity fall, all take the same amount of time, even if the line doesn't go through the center of the earth.
For example, The Alameda-Weehawken Burrito Tunnel
from the article:
Who can imagine New York City without the Mission burrito? Like the Yankees, the Brooklyn Bridge or the bagel, the oversize burritos have become a New York institution. And yet it wasn’t long ago that it was impossible to find a good burrito of any kind in the city. As the 30th anniversary of the Alameda-Weehawken burrito tunnel approaches, it’s worth taking a look at the remarkable sequence of events that takes place between the time we click “deliver” on the burrito.nyc.us.gov website and the moment that our hot El Farolito burrito arrives in the lunchroom with its satisfying pneumatic hiss.
The tunnel opened to great fanfare in 1933, with a congratulatory message in Morse Code flashed by powerful searchlight from the San Francisco end to waiting dignitaries on the New Jersey side. It was already obsolete. The first regular mail shipments sent from San Francisco in the spring of 1934 had to compete with the sophisticated air mail system that had grown up during the tunnel’s long construction.
The globetrotting Cavanaugh was a fanatic of the recently-invented Mission burrito but bemoaned being unable to get it anywhere outside of San Francisco. Examining blueprints of the defunct mail tunnel on a flight home to New York, Cavanaugh became intrigued by the coincidence in size between a foil-wrapped burrito and the diameter of the old transcontinental mail tubes. By the time the plane landed, he had come up with an audacious plan.
Cavanaugh realized that the intense heat of the transit that had so beleaguered mail service would actually work to his advantage in a burrito tunnel. The burritos could be stored frozen on the Western end and arrive fully heated through in New Jersey. Furthermore, advances in electrical engineering meant that containers would no longer have to be propelled by compressed gas. The burritos already came conveniently wrapped in aluminum foil - it would be trivial to accelerate them with powerful magnets.