It had:

  • An AI that got its own planet
  • An interplanetary train system, with portals on every planet
  • An elf-like species that could travel through weird portals called "the paths" or something like it
  • no ships, towards the end of the story
  • an invader species that has smart immobile units and dumber mobile units
  • the artificial intelligence made "restricted intelligence" as a gift to humans
  • A nova bomb is made and used towards the end
  • People have many implants that make them better at things

Does anyone know the title and author of the book?

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    The train bit along with the implants immediately makes me thing of Peter F Hamilton's Commonwealth Saga, but I haven't read most of the series and the plot points aren't ringing any bells. – Harabeck Dec 13 '19 at 21:25
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    (Wow, the new automatic text for dupe closures looks weird and almost confrontational and doesn't really suggest that you're just notifying of a duplicate) – starpilotsix Dec 14 '19 at 1:17

The is Pandora's Star and Judas Unchained, the first and second halves of a 2000-page novel by Peter Hamilton set in his Commonwealth saga. It's a match to your specs in every respect.

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    Isn't Pandora's Star the first and Judas Unchained the second? – user22484 Dec 14 '19 at 7:02
  • @user22484 Yes. You can edit the answer. – Faheem Mitha Dec 14 '19 at 7:33

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