How low have mains frequencies gone? What areas once used 30 Hz, and why?

Votes are +10/-3, there are three good answers with summed votes +18/-0, and the answers.

The stated close reason is:

Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design.

I'm not sure how this applies because design of a power distribution includes the choice of mains frequency (in this case as low as 30 Hz) and this is certainly a circuit, and questions about mains power distribution are demonstrably on-topic (I can find many that are well-received and answered).

The only negative comment I've found is that it lacks

enough effort or EE aptitude

but I don't know if that's the reason this question was closed or not.

So my questions are only:

  1. Was this question likely closed for the stated close reason, or for a different reason that's not stated?
  2. What edits can be done to address either the stated or the likely close reason that wouldn't conflict with the existing answers?

One edit I can think of off the top of my head is moving the "why?" to the beginning of the title.

  • \$\begingroup\$ Possibly because the title had 3 different history questions with volumes written about the subject. Perhaps reasons like too many questions with 1st two could be answered by basic history research and the last needing a long debate about efficiency and costs. . In any case I think I was the only person who both criticized and answered the 1st question instantly. 16Hz for railways by Siemens in 1904. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jan 6 at 11:21
  • \$\begingroup\$ Thanks, I'm looking for the actual close reason. Also, that doesn't address the "why". \$\endgroup\$ – uhoh Jan 6 at 12:02
  • \$\begingroup\$ I guess the historical use of 30 Hz is off-topic \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jan 6 at 12:04
  • \$\begingroup\$ I won't take that seriously unless you post it as an answer and others can vote on it. Let's get some community consensus. \$\endgroup\$ – uhoh Jan 6 at 12:05

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