I’ve googled it but just can’t seem to grasp it. How do they stay on as well as they do at such high speeds, with so few incidents of crashing or derailing? Especially when anything could be lying across the track waiting to get lodged in the wheels.
I hear so often that trains are so safe, but I don’t think I can get over my anxiety with them until I understand *why* they’re safe.
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On top of how the wheels work and the difference in masses, it turns out that it’s actually pretty hard to derail a train even when you remove chunks of track. The [Army ran tests during WWII](https://www.youtube.com/watch?v=agznZBiK_Bs) to figure out what was required to sabotage a rail line.
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