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The only thing I remember was that the prince or son of the duke of the kingdom was tasked to go visit the territory of the female main character and she didn't want all of the technology to be spread or something like that.

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  • 1
    Hi, welcome to SF&F. When did you read this? Do you remember where?
    – DavidW
    Commented Aug 28 at 18:56
  • FMC? Foreign Military Country?
    – FuzzyBoots
    Commented Aug 28 at 19:01
  • 2
    @FuzzyBoots - 'FMC' almost certainly = female main character. Commented Aug 28 at 19:06
  • @Weirdo - What did you mean by 'train'? Did the MC train to learn some skill? Or did she build a physical train? And was this black & white or full colour? Commented Aug 28 at 19:19
  • 2
    Is this literal salt or child abuse/bullying?
    – qazmlpok
    Commented Aug 28 at 19:44

1 Answer 1

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This is Offense and Defense in Daites, aka Daites-ryou Koubouki, also identified here.

Ohmi Crown Prince Matisa has been ousted and ordered to go to the province of Daites and wed its young lady, Miliana. Known for its isolation, Daites serves as a place where he will never be able to rally influence—the perfect place for the banished prince.

Contrary to expectations however, Daites is secretly a booming province of wealth and innovation. The source behind this is Miliana herself, who bears memories of her past life in modern-day Japan. Using her photographic memory, she has introduced advanced technology, new forms of transportation, infrastructure, and even weaponry.

The province is like Atlantis in that all of her inventions have been kept secret, and haven't spread outside of the now-prosperous but isolated region.

enter image description here

The prince was sent here to marry the MC because the queen didn't like him, and preferred his brother, and this was a way to get rid of him.

Her innovations do include a method of processing salt from a salt lake (instead of the ocean),

enter image description here

and a locomotive.

enter image description here

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