Foxtrot X was one of a series of the Federation's Foxtrot Outposts in Foxtrot Sector, meant to monitor the border on the Federation-Romulan Neutral Zone.

This outpost was demolished in the Tomed Incident cataclysm. (TLE novel: Serpents Among the Ruins)

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Federation outposts
Various facilities	Epsilon Ceti Outpost • Outpost Hadrian • Science Outpost D5 • Outpost Seran T-1 • Two Dawns		Archives	Daystrom One • Memory Alpha • Memory Beta • Memory Gamma • Memory Delta • Memory Epsilon • Memory Prime • Symphony Alpha	Mining facilities	Beta Argola mining outpost (Beta Argola) • BorSitu Minor mining outpost (Borsitu Minor) • DSE-Grissom • Alpha • Beta • Gamma • Delta • Omicron • Theta • Epsilon
Planetary outposts	771 • Archanis IV research outpost (Archanis IV) • Babel Station (Babel) • Boradis III outpost (Boradis III) • Bunker (Earth) • Calder II outpost (Calder II) • Caleb IV outpost (Caleb IV) • Cestus III Outpost (Cestus III) • Darwin Genetic Research Station (Gagarin IV) • Delta VII outpost (Delta VII) • Elaphe Vulpina IX outpost (Elaphe Vulpina IX) • Ellison Research Outpost (Gateway) • Ennis Outpost • Eridian Vault (Eris) • Facility 18 (New Montana) • Fort Fed (Tenkara) • Haven Facility (Vesuvi VI) • Outpost Hunter (Delta Vega) • Ohniaka III outpost (Ohniaka III) • Obsidian outpost (Obsidian) • Prometheus Science Center • Setlik III outpost (Setlik III) • Sowtha depot (Sowtha) • Starfleet Headquarters (Earth) • Outpost T-22 (Kalandra Minor) • Thraz Outpost • Vostok Academy (Mercury) • ULAPG42821DB (Psi 2000)
Space station outposts	40 • 47 • 61 • Ariadne 1 • Asimov Center • Avogadro Center • Avril Station • Babel Orbital Center • Benecia Medical Station • BiblioTech 1 • Boundary 1 • Bova Center • Bradbury Center • Brahms Center • Brin Center • Brundage Point Listening Station • Clanhaven 1 • Cochrane Center • Chriton Center • Clark Center • Compassion 1 • Daystrom Center • Doppler Center • Espoir Station • Facility 4028 • Frege Center • Gamma Hydra 1 • Ipicran 1 • Gibson Center • Heinlein Center • Huxley Center • Station Kel-Artis • Linden Navigational Outpost • Manheim Temporal Research Facility • Maximus 1 • Mercy 1 • Mertens Orbital Research Station • Niven Center • Othello 1 • Parley Point 1 • Planck Center • Pournelle Center • Sagan Center • Sarak Center • Simmons Center • Soong Center • Terra 1 • Unitas 1 • Unity Point 1 • Ursis Load A-1 • Ursis Load B-1 • Verne Center • Welles Center
	Federation Defense Outposts	6 • 18 • 29 • 36 • 43 • 44 • 60 • 85 • 89 • 91 • 102 • 112 • 148 • 157 • 194 • 216 • 229 • 238 • 248 • 287 • 323 • 337 • 361 • 366 • 372 • 375 • 396 • 417 • 438 • 457 • 498 • 507 • 524 • 545 • 573 • 579 • 581 • 602 • 607 • 608 • 629 • 665 • 724 • 735 • 768 • 780 • 797 • 856 • 859 • 893 • 930 • 1038 • 1051 • 1121 • 1204 • 1237 • 1286 • 1317 • 1378 • 1426 • 1427 • 1428 • 1520			Outer Sector Defense Outposts	1 • 4
	Intelligence stations	Bargrik 1 • Bugblatter 1 • Charybdis 1 • Chimera 1 • Dragon Lady 1 • Fafnir 1 • Gammorah 1 • Ghidrah 1 • Grendel 1 • Gritchin 1 • Hyde 1 • Mothra 1 • Namu 1 • Nightmare 1 • Nosferatu 1 • Pennywise 1 • Polladori 1 • Poltergeist 1 • Raven 1 • Rodan 1 • Sasquatch 1 • Scylla 1 • Shadow 1 • Snark 1 • Tingler 1 • T'prelki 1 • Typhon 1 • Vermithrax 1 • Vlad 1 • Wief 1
	Romulan Neutral Zone Outposts	Earth Outpost Stations: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 32 • Foxtrot Outposts: I • II • III • IV • V • VI • VII • VIII • IX • X • XI • XII • XIII • Quebec Outposts: 1 • 2 • 3 • 4 • 5 • 6 • Romeo Outposts: 1 • 2 • 3 • Sierra Outposts: 1 • 2 • 3 • 4 • 5 • 6 • 7 • Tango Outposts: 1 • 2 • 3 • 4 • Watchtowers: 13
	Gamma Outposts	7	Delta Outposts	1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9	Epsilon Outposts	1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11
	Deep space research facility	39	FCO Outposts	47	Jupiter Outposts	92 • Jupiter Station • Ganymede Station
	Processing facilities	057 • 156 • 295 • 406 • 409 • 645 • 684 • 786	Relay stations	47	Trading stations	549 • 680 • 1059 • 1080 • 8243 • 9400 • 9835 • 9874