If you are referring to railings that are part of a structure:
* Balustrades: This is a formal term for a series of balusters (small vertical supports) topped by a rail.
* Handrails: These are rails designed for people to hold onto for support.
* Guardrails: These are designed to prevent people from falling, often used in stairwells or on balconies.
* Parapets: These are low walls that are used to provide a barrier, sometimes incorporating railings.
* Fencing: This is a broader term for any type of barrier, including railings.
If you are referring to multiple sets of railings in a specific location:
* Railing system: This emphasizes the interconnected nature of the railings.
* Railing network: This emphasizes the extent and spread of the railings.
For a more specific context, please provide more details. For example, if you are talking about railings on a bridge, you could use "bridge railings" or "bridge parapet."