Look at those engineers. They're not screaming in panic or leaping to safety; they're winning the world's most awesome bet. The back one is ghost riding the whip so hard that Indiana Jones spent his entire career wondering why it smelled of another man's gigantic balls. That train isn't going to explode, it's going to punch through the entire planet, burst out of the Pacific, and get the moon pregnant.
Popular Mechanics combined forward thinking with backward body issues. They apparently predicted global warming and sea level changes, because whenever a woman appeared on the cover, it was in a swimsuit. Men did everything else, but if someone was going to get wet, then it was going to be a woman. Which was unfortunately the closest the popular mechanics could come to feminism.
Popular Mechanics via Cover Browser
"All aboard the Saucy Sue!"