User talk:Luuluu MuuMuu: Difference between revisions - Wikipedia

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:[3] As for the use of aluminium conductor rails, the skin effect is around 12 millimetres or so (we can safely neglect the steel running surface). You haven't done all the maths. The rail size is still very large compared with that skin depth and the resistance of the aluminium rail is still around 40 times larger to 50&nbsp;Hz AC than it is to DC. However, this apparant advantage of using aluminium is shot down completely by your very first argument. The return running rail is still made out of steel and still has a substantially higher resistance to AC than it does to DC. Many light and 'metro' type railway systems do use aluminium conductor rails these days, but none of them uses AC - not even new build systems. London Underground (LUL) are introducing aluminium conductor rails for the third and fourth rails, but LUL remains a DC system. AC would still not be feasible because the AC resistance of a pair of aluminium rails would still require the substations to be 50 odd metres apart. –[[User:LiveRail|<span style="font-variant:small-caps"><font color="green">Live</font><font color="Red">Rail</font>]]&nbsp;[[User talk:LiveRail|<font color="blue">&lt;&nbsp;'''Talk'''&nbsp;&gt;]]</font></span> 13:55, 1 May 2014 (UTC)

Congratulations!! You have just self-proven that even an AC railway that uses steel rails for the return circuit is not feasible, because the substations would need to be placed only a few hundred meters apart. It must be pure magic that on the high speed lines in Europe that the substations that feed in power (not the auto-transformer sites), are spaced around 50 miles (80 km) apart. Just how do these AC railways get away with returning hundreds of amps along steel rails back to the substation??? It seems almost impossible based on your statements ... which are now a matter of public record (is your company still watching?). - [[User:Luuluu MuuMuu|Luuluu MuuMuu]] ([[User talk:Luuluu MuuMuu#top|talk]]) 23:54, 1 May 2014 (UTC)