Which type of door can be either hinged or slide open like a pocket door?

The type of door that can be either hinged or slide open like a pocket door is known as a plug door. Plug doors are designed such that they can seal against the vehicle body when closed and can slide into a pocket or space in the vehicle structure, allowing for efficient use of space. This dual functionality helps prevent issues with air leakage and provides a reliable barrier, making them suitable for use in various vehicle types, particularly in transit and rail applications. The design adaptability of plug doors makes them unique compared to other door types, which may not offer the same sliding capability or versatility in installation.