Silver Horseshoe Society

The Silver Horseshoe Society is a reclusive organization of aristocratic ponies in Poneva city. They are featured prominently in Fallout: Equestria - Rising Dawn

In When the Cold Breeze Blows Away, they would be founded in the post-Last Day that they would find and help any living creatures from dangerous and enemies, and they're part of the Three Pony Families alliance.

Unlike the White Glove Society, they're treated as a militant faction and/or a country, and are located in the remnants of the post-apocalyptic Canterlot Subway System. Also, they have combined well-dressed, well-spoken, and well-behaved manners (even with formal party themes) with totalitarian left-wing politics.

At the time of the Great P365 War, it administers sixteen stations directly and is known to hold de facto control over at least two satellite stations, Armory, known as Iron Mare Bridge Street in the pre-war world, and New Canterlot Theater (the pre-war Showmare Station). The Friendship Line is the artery of the SHS, on which most of its stations are located and to which all connect.

One of the most powerful factions in the Canterlot Subway, alongside the likes of Hanseatic Stable, the Red Line is in a state of permanent conflict with the much smaller, highly-efficient and brutally-effective far-right regime of fascist stations known as the Earth Pony Reich.

It's ruled by Fancy Pants.

Trivia

 * The Silver Horseshoe Society in When the Cold Breeze Blows Away resembles much of the White Glove Society (Fallout), the Red Line (Metro 2033) and the Free French Army (real life).