An observant birdwatcher is to thank for bullet trains that don't produce astounding booms that resonate for hundreds of feet every time they pass through a tunnel. It's a fascinating story ...

This discrepancy is widest in Asia, home to the most efficient and fastest trains in the world, as well as the most extensive network of tracks.

Today it has some of the fastest trains in the world. Here's how Japan did it. More from Tech Japan was the first country to build narrow-gauge railways dedicated to high-speed trains. Today it ...