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MSNManufacturing Insights
5 Secret Codes Used to Communicate in the Underground Railroad | HISTORY
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5 Secret Codes Used to Communicate in the Underground …
May 30, 2012
history.com
Ever wondered why early railroad signals used white light for “go”… and why it became one of the most dangerous design flaws in transportation history? 🚂 Imagine being a train engineer in the late 1800s, racing down dark tracks at night, trusting the signals ahead to guide every decision. Back then, white meant “all clear.” But there was a fatal problem—if a red stop lens broke, the lantern behind it would shine white light. To an engineer approaching at speed, that broken signal looked exactly
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Ever wondered why early railroad signals used white light for “go”…
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