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Are youngers being more stupid?
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Old 22nd February 2020, 05:48 PM   #591
Pharos is offline Pharos  United Kingdom
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No, Southern Railway worker, Kent.
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Old 22nd February 2020, 07:01 PM   #592
PRR is online now PRR  United States
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> UK rail runs on 25kV.
> You were thinking of the london underground? 630V tracks iirc...


The motors run on something like 600V.

Sending 600V at HIGH current many miles is inefficient. The step-down from 20kV to 600V has moved over the century, from the end of the line, to substations every few miles, and apparently now into the car. So yeah, old info is obsolete.

However 3rd-rail and similar small-space applications would not run 20kV because it would jump and bite people. I could imagine an underground still running 600V.
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Old 22nd February 2020, 11:15 PM   #593
Pharos is offline Pharos  United Kingdom
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Yes of course I had forgotten that that principle applies to the railway system as well, it must be over forty years ago that we studied that in college.

I was immediately thinking about insulation problems and weather with 20kV.
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