The southeastern network operates on a 750V DC third rail, at Ebbsfleet trains join the international standard <a href="https://en.wikipedia.org/wiki/High_Speed_1" class="extiw" title="w:High Speed 1">High Speed 1</a> 25 kV 50 Hz OHLE. So towards London it is overhead, and towards Rochester third rail which starts here.
<a href="//commons.wikimedia.org/wiki/User:ClemRutter" title="User:ClemRutter">ClemRutter</a>
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<span class="int-own-work" lang="en">Own work</span>