A Train Whistle Mystery.
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A Train Whistle Mystery.

Travel by train around the United States and, if you’re paying attention, you’ll soon notice that Amtrak engineers blow the whistle quite a lot. And if you’re really paying attention, you’ll notice that there are several different whistle patterns—for example, two short toots when the train is about to move forward; three toots when it’s…

Railroads Solved Big Problems With A Little Physics.
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Railroads Solved Big Problems With A Little Physics.

One of the remarkable things about trains and train travel is the fact that modern railroads are still using technology that’s 150 or so years old. Certainly, there have been refinements like computers in the locomotive cabs and the complex system of signals that keep trains from running into each other. But essentially, trains today…