I note Mark A's reference to Thingley Junction and the associated OLE terms mentioned. I can recommend Garry Keenor's self published "Overhead Line Electrification for Railways" available both as a pdf and a hard back book. Garry is a Chartered Engineer, have a gander at www.ocs4rail.com. Perhaps I ought to add I have no connection to Gary, just a strictly amateur interest.

 
Thank you for your post, BahnCard100 - and for quoting your source and disclaimer of any commercial interest.

On the Coffee Shop forum, we are delighted to see members posting such links to relevant reference material.

CfN.

 
Bit of a thread drift here, mods !

 

Noted - probably worth a split for the visibility benefit of both topics.

 
As an occasional poster in this forum I would like to continue with my last mention of Garry Keenor, a chartered engineer and author of Overhead Line Electrification for Railways.
Once again I should stress that I do not know Garry personally and I have only an amateur interest in the subject. My thanks to Chris from Nailsea for his kind reply.
To continue I found a YouTube video from a recent (December 2025) Wales & West meeting of the Permanent Way Institution which Garry addressed as professional lead for electrification.
His talk was entitled (I don't) Mind the Gap, in which Garry continues to simplify the use of electrification for traction generally both in overhead supply and in battery stored form. In other words he is explaining what intermittent electrification of railways would mean. I hope others find it as interesting as I did.
My apologies if I have posted in the wrong place.

 

A minor confusion, which I have resolved, BahnCard100.

Thank you for continuing to post such interesting and useful information - no matter how 'occasional'.