Some things just do not make sense. I can't imagine a "cloud" like the one described below visiting our world today. An act of war comes to mind. Anyways, judge for yourself, but I'm leaning towards some tech we are not allowed to know about.
|19th Century: Hyperloop Pneumatic and Atmospheric Subways and Railways||Cars, Bikes and Trains||3|
|Atmospheric electricity and building destruction in the 19th century||Urban Fires and Earthquakes||2|
|19th century Crematoriums vs. Ancient Iron Melting Plants||Crematoriums||1|
|Slavyanovsky Glass - 19th Century Welding||Technology||1|
|19th Century: Public & Private Steam Transportation||Cars, Bikes and Trains||13|