Collapsible seat and system

Collapsible seats may be installed on a track or rail system to allow the collapsible seats to move laterally within a vehicle's interior. The track system also may permit removal of the collapsible seats from the vehicle. The collapsible seats may include a seat back with multiple sections joined by flexible hinges that permit folding of the seat pan and seat back in a lateral direction. In certain embodiments, the seat pan or the headrest also may include multiple sections joined by flexible hinges. The flexible hinges may allow the seats to collapse laterally to reduce the width of the seats. The available space for seating or cargo storage may be adjusted by selectively collapsing, expanding, and removing the collapsible seats.