skrev i en meddelelse news: snipped-for-privacy@g14g2000cwa.googlegroups.com...
"Facts" without theory are often soo much much Garbage ... people like to stop with the "facts" part because it saves them from thinking; specifically to determine the relevance of all the alledged facts!
If you are soo worried about 200 Hz pulses in an electric train should you not rather worry more about the combined "radiation" from the hundreds-of-kW Motor Drives running at Audio Frequency - which is sitting about one meter below your balls - and the looong antenna right over your head?
PS:
The converters in trains happen to use the Industrial EMI standards: Filter if the it disturbs the neighbours TeeVee and Radio - the filter goes on the disturbed bit ... .