Castle Bravo is a Crown controlled high-security weapons testing facility, located off the north-eastern tip of Blacktop Island in the Badlands. It is responsible for the study and development of Quinta and non-Quinta explosives, artillery, small arms, and torpedoes.

The castle is accessible via King's Line, as the eastern-most stop. Civilians must therefore disembark at Quarry, where all trains pass through a high-security checkpoint.