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00:00:11 1 Overview
00:01:11 2 History
00:05:11 3 Distribution networks
00:05:57 4 Standardisation
00:07:09 5 Variations
00:07:23 5.1 25 kV AC at 60 Hz
00:08:40 5.2 20 kV AC at 50/60 Hz
00:09:02 5.3 12.5 kV AC at 60 Hz
00:10:04 5.4 6.25 kV AC
00:11:10 5.5 50 kV AC
00:11:50 5.6 2 x 25 kV autotransformer system
00:13:03 5.7 2 x 15 kV autotransformer system
00:13:31 5.8 Boosted voltage
00:13:50 5.9 25 kV on narrow gauge lines
00:14:31 6 Multi-system locomotives and trains
00:14:55 7 See also



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SUMMARY
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25 kV alternating current electrification is commonly used in railway electrification systems worldwide, especially for high-speed rail.

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