[Geoff_T]

Originally Posted by AnalogUniverse

i started a thread in the "so much gear" forum and didn't really get the response i was hoping for... so i figured i'd bump it over to you folks.

http://gearslutz.com/board/showthread.php3?t=45644

any ideas would be greatly appreciated

Hi

Aeons ago I worked on electrical power switching equipment that included the London Underground. Back then (1960's) they used 660 volts dc for everything.

You could get some very interesting shocks off those kinds of voltages... very disabilitating!

Nowadays the trains are a little more high tech and use semi-conductor control but they always could use regenerative braking by complex switching.

As the carriage floor is right over the motors on the axles there must be some strong fields flying around but there are so many arcs and sparks on the commutators and track pick ups that I can't imagine how it would sound if you tried to record it! The noise would extend from LF to RF!

An interesting idea though!