Railway Overhead Lines

[Bonzo 2000]

I'm having trouble finding information on the overhead lines set-up on railways in Britain. Does anyone have any web resource or knowledge on this? I'm trying to get info on the apparant earth bonding of each pylon to the adjacent rail, and the insulated cable attached to the top of each pylon by a single insulator, running parallel with the rails. Any help appreciated

[deggers316]

surely the company you work for should have all the info
sorry but this sounds odd to me that an individual should be asking this on a web forum