Actually Edison Illuminating Company of America installed the first electric lights on the UK railway in the 1920s at Fenchurch Street (London) so they used what they were experienced with ... and because its safer.
The UK railway hasn't changed it since. From: Ted Eckert [mailto:ted.eck...@microsoft.com] Sent: 04 July 2012 23:59 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Interview Questions I think Ken is on the right track. Railroad signally and portable equipment both represent areas where there is a higher risk of exposed connections. Receiving a shock from 110V is unpleasant, but it is less likely to lead to significant harm than a 240 V shock. I've contacted 110V a number of times and it seems to have had no ill effects other than starting e-mail messages with bad puns. Ted Eckert Compliance Engineer Microsoft Corporation ted.eck...@microsoft.com<mailto:ted.eck...@microsoft.com> The opinions expressed are my own and do not necessarily reflect those of my employer. From: IBM Ken [mailto:ibm...@gmail.com]<mailto:[mailto:ibm...@gmail.com]> Sent: Wednesday, July 04, 2012 1:50 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: Interview Questions It's safer! :-P :-D On Wed, Jul 4, 2012 at 12:28 PM, Scott Xe <scott...@gmail.com<mailto:scott...@gmail.com>> wrote: Hi Andy, Is there any particular reasons to have 110 Vac for railway signalling system in a 230/240 Vac country? Scott On 4/7/12 3:10 PM, "Andrew McCallum" <andrew.mccal...@deltarail.com<mailto:andrew.mccal...@deltarail.com>> wrote: > The UK railway signalling system all runs at 110 V AC 50 HZ > Andy > > -----Original Message----- > From: John Woodgate > [mailto:j...@jmwa.demon.co.uk<mailto:j...@jmwa.demon.co.uk>] > Sent: 03 July 2012 21:17 > To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: Interview Questions > > In message > <CAKEabA3B=iqyzpyjzmb5tjdewp+eowdq40fu9dh88oah6a1...@mail.gmail.com<mailto:iqyzpyjzmb5tjdewp%2beowdq40fu9dh88oah6a1...@mail.gmail.com>>, > dated Tue, 3 Jul 2012, IBM Ken <ibm...@gmail.com<mailto:ibm...@gmail.com>> > writes: > >> PS: Who operates at 110VAC 50Hz? > > Portable equipment used on construction sites; it's actually 55-0-55, with the > centre grounded. > -- > OOO - Own Opinions Only. 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