Johan,

Many thanks for the reference. I now understand much better how these things 
are arranged.

73 John F5VLF
> On 29 Mar 2016, at 09:11, Johan Bodin <[email protected]> wrote:
> 
> That problem can be solved by using a return line and booster transformers 
> that minimises current leakage into surrounding earth:
> 
> https://library.e.abb.com/public/f1200714de5086c585257d7300287357/1LFI2026%20special%20power%20transformers%20for%20railway%20-%20brochure%20EN.pdf
> 
> 73 de
> Johan SM6LKM
> 
> Den 2016-03-17 kl. 15:18, skrev Andy Talbot:
>> Is that to minimise skin loss in steel track ?
>> 
>> UK Third rail is, of course, DC, and I once spent an idle moment calculating 
>> the loss if 50Hz AC were to be used with magnetic iron conductors.  I think 
>> I came to the conclusion a 1MW train could probably travel a few hundred 
>> metres before it lost its power supply.
>> 
>> andy  G4JNT
>> 
>> On 17 March 2016 at 13:21, Johan Bodin <[email protected]> wrote:
>> Railway QRG is 16 2/3 Hz in Sweden too.
>> 
>> 73 de Johan SM6LKM
>> 
>> John Rabson wrote:
>> I seem to recall that some railway systems use at about 16 2/3 Hz (one third 
>> of 50 Hz) for traction.
>> ...
>> Can someone say whether my recollections are correct, please?
>> 
>> 73 John F5VLF
>> 
>> 
> 

[email protected]

Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE