Train window

Life is full of little mysteries, like why dashboards are called dashboards and what flavour “cola” and “red velvet” really are.

And during a recent Instagram scroll, yet another commonly-ignored quandary presented itself to me.

“Why does the train have the little dots by the window?”, engineering trivia expert Engineered Against Your Will asked in a video.

After all, they explained in their caption, they’re “Not just for decoration.”

What do the black dots on train windows do?

First of all, they’re not exclusive to trains – you’ll find them on

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