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A comment on Glowing mercury thyratrons: inside a 1940s Teletype switching power supply. Parent comment

Re:Glowing mercury thyratrons: inside a 1940s Teletype switc... by Animats on Monday September 10, 2018 @03:14PM (#17954269)
The Isle of Man Electric Railway had a huge mercury vapor rectifier in active use until 2010.[1] I saw it in operation once. It would glow brightly when the trams were drawing high power.

[1] https://www.flickr.com/photos/trained_4_life/10978575914

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