Post #2739336
2026-01-06 22:52 UTC
@PalmAndNeedle@norden.social @Aurora_Bee@deadinsi.de
Yes, hence thee need to insulate the points.
Ground level traction power does exist, third rails.
In fact, the London Tube employs a dedicated, insulated fourth ground rail because the traditional method of using the running rails for grounding caused galvanic corrosion between iron tunnel ring segments and the surrounding earth greatly shortening their lifespans.
Replies (1)
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@PalmAndNeedle@norden.social 2026-01-06 23:03
@evdelen@mstdn.ca @Aurora_Bee@deadinsi.de That's an extremely niche edge case solution for a very specific problem stemming from the need to keep ancient technology working, namely iron tunnels. It's not even used on the whole London underground system. Mainline rail with catenary uses the rails as ground. That's just a given.