In Assassin's Creed Syndicate, the Assassins' mobile headquarters is the Rooks' train.
The train is a movable base used by Jacob and Evie Frye and their gang, the Rooks. It travels through London and functions as a practical headquarters for planning, upgrading abilities, and managing the gang's operations. Its mobility reflects the game's industrial setting and its emphasis on railways, factories, and rapid urban travel.
Syndicate is set in London in 1868, during the Industrial Revolution. The Frye twins work to weaken Templar control by liberating boroughs and recruiting local allies. The train is distinct from the Royal Train, which appears as part of a mission, and from fixed landmarks such as the Tower of London. The game's London includes recognizable locations including Big Ben, Buckingham Palace, and the River Thames, but the Rooks' train is the headquarters that moves with the protagonists.