Located on straight circuit sections, these use pneumatics to rotate a shaft studded with cams into and out of engagement with C-shaped receptacles (locating cam cutout) on the carriage bodies. This arrangement can be complemented by inductive proximity sensors if needed to verify carriage location...
example, when in an aircraft, a simulated engine fire may be addressed by retarding the throttle to idle, simulating the shutdown of the engine, simulating the discharge of the fire suppression agent, if applicable, simulating the disconnection of associated electrical, hydraulic, and pneumatics ...