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An apparatus for a handrail system having railings; the apparatus includes: a rail-mountable assembly; a table assembly having a table surface; a sub-mount assembly; a folding assembly; and an interlocking bracket assembly, including a first mounting bracket configured to be fixedly connected to the

An apparatus for a handrail system having railings; the apparatus includes: a rail-mountable assembly; a table assembly having a table surface; a sub-mount assembly; a folding assembly; and an interlocking bracket assembly, including a first mounting bracket configured to be fixedly connected to the rail-mountable assembly and a second mounting bracket configured to be fixedly connected to the sub-mount assembly. The first mounting bracket and the second mounting bracket are configured to be selectively engageable with each other.

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1. An apparatus, comprising: a rail-mountable assembly configured to be fixedly connected to a selected length of the railings of a handrail system;a table assembly having a table surface;a sub-mount assembly;a folding assembly configured to be fixedly connected to the table assembly, and also confi

1. An apparatus, comprising: a rail-mountable assembly configured to be fixedly connected to a selected length of the railings of a handrail system;a table assembly having a table surface;a sub-mount assembly;a folding assembly configured to be fixedly connected to the table assembly, and also configured to be fixedly connected to the sub-mount assembly; andan interlocking bracket assembly, including: a first mounting bracket configured to be fixedly connected to, and project from, the rail-mountable assembly; anda second mounting bracket configured to be fixedly connected to, and project from, the sub-mount assembly; andthe first mounting bracket and the second mounting bracket configured to be selectively engageable with each other; and wherein: the first mounting bracket and the second mounting bracket are configured to be selectively slide engageable with each other; andthe first mounting bracket includes a first base portion, and also includes first longitudinal side rails that extend from opposite sides of the first base portion in such a way as to form a U shaped profile, and opposite ends of the first longitudinal side rails define openings; andthe second mounting bracket includes second longitudinal side rails positioned on opposite sides of the second mounting bracket, and also includes a stop portion positioned at an end of the second longitudinal side rails, and also includes an opening defined at the end located opposite to the stop portion, and the opening is positioned at another end of the second longitudinal side rails opposite from the stop portion; andthe first longitudinal side rails and the second longitudinal side rails are slide engageable with each other. 2. The apparatus of claim 1, wherein: the folding assembly is also configured to permit selective foldable movement of the table assembly between a table-deployment position and a table-storage position in response to the folding assembly receiving an application of a force to do just so;in the table-storage position, the table assembly is moved towards the sub-mount assembly in such a way that space underneath the table assembly is reduced, at least in part; andin the table-deployment position, the table assembly is moved away from the sub-mount assembly in such a way that space underneath the table assembly is increased, at least in part. 3. An apparatus, comprising: a rail-mountable assembly configured to be fixedly connected to a selected length of the railings of a handrail system;a table assembly having a table surface;a sub-mount assembly;a folding assembly configured to be fixedly connected to the table assembly, and also configured to be fixedly connected to the sub-mount assembly; andan interlocking bracket assembly, including: a first mounting bracket configured to be fixedly connected to, and project from, the rail-mountable assembly; anda second mounting bracket configured to be fixedly connected to, and project from, the sub-mount assembly; andthe first mounting bracket and the second mounting bracket configured to be selectively engageable with each other; and wherein: the first mounting bracket and the second mounting bracket are each configured to support a vertical load;the first mounting bracket includes a first base portion, and also includes first longitudinal side rails that extend from opposite sides of the first base portion in such a way as to form a U shaped profile, and opposite ends of the first longitudinal side rails define openings; andthe second mounting bracket includes second longitudinal side rails positioned on opposite sides of the second mounting bracket, and also includes a stop portion positioned at an end of the second longitudinal side rails, and also includes an opening defined at the end located opposite to the stop portion, and the opening is positioned at another end of the second longitudinal side rails opposite from the stop portion; andthe first longitudinal side rails and the second longitudinal side rails are slide engageable with each other; andthe first mounting bracket and the second mounting bracket are slide engageable with each other in such a way that: the rail-mountable assembly and the second mounting bracket are engaged with each other in an engagement position in which the first mounting bracket remains fixedly connected to the rail-mountable assembly, the second mounting bracket remains fixedly connected to the sub-mount assembly, and the rail-mountable assembly and the second mounting bracket are engaged with each other; andthe rail-mountable assembly and the second mounting bracket are disengageable from each other in a disengagement position in which the first mounting bracket remains fixedly connected to the rail-mountable assembly, the second mounting bracket remains fixedly connected to the sub-mount assembly, and the rail-mountable assembly and the second mounting bracket are disengaged from each other. 4. The apparatus of claim 3, wherein: the folding assembly includes: a first folding portion configured to be fixedly connected to the table assembly; anda second folding portion configured to be fixedly connected to the sub-mount assembly; andthe first folding portion and the second folding portion are pivotally connected together at a pivot, and the first folding portion and the second folding portion are configured to be pivotally movable relative to each other at the pivot between a table-deployment position and a table-storage position. 5. The apparatus of claim 1, wherein: the first mounting bracket and the second mounting bracket are configured to transfer weight from the table assembly, the folding assembly and the sub-mount assembly toward the rail-mountable assembly and the railings of the handrail system in such a way that the table assembly remains operatively supported at a table-storage position and at a table-deployment position. 6. The apparatus of claim 1, wherein: the table assembly has a rectangular shape. 7. The apparatus of claim 1, wherein: the sub-mount assembly has a length equal to the length of the table assembly. 8. The apparatus of claim 1, wherein: the sub-mount assembly has a rectangular shape. 9. The apparatus of claim 1, wherein: the first mounting bracket includes a male portion; andthe second mounting bracket includes a female portion. 10. An apparatus, comprising: a rail-mountable assembly configured to be fixedly connected to a selected length of the railings of a handrail system;a table assembly having a table surface;a sub-mount assembly;a folding assembly configured to be fixedly connected to the table assembly, and also configured to be fixedly connected to the sub-mount assembly; andan interlocking bracket assembly, including: a first mounting bracket configured to be fixedly connected to, and project from, the rail-mountable assembly; anda second mounting bracket configured to be fixedly connected to, and project from, the sub-mount assembly; andthe first mounting bracket and the second mounting bracket configured to be selectively engageable with each other; and wherein: the second mounting bracket includes: second longitudinal side rails being positioned on opposite sides of the second mounting bracket;a stop portion being positioned at an end of the second longitudinal side rails;an opening being defined at the end located opposite to the stop portion, and the opening being positioned at another end of the second longitudinal side rails opposite from the stop portion; anda second base portion extending between the second longitudinal side rails. 11. The apparatus of claim 10, wherein: the first mounting bracket includes: a first base portion; andfirst longitudinal side rails extending from opposite sides of the first base portion; andwherein the first longitudinal side rails extend from opposite sides of the first base portion in such a way as to form a U shaped profile, and opposite ends of the first longitudinal side rails define openings. 12. The apparatus of claim 11, wherein: the folding assembly includes: a first folding portion configured to be fixedly connected to the table assembly; anda second folding portion configured to be fixedly connected to the sub-mount assembly; andthe first folding portion and the second folding portion are pivotally connected together at a pivot, and the first folding portion and the second folding portion are configured to be pivotally movable relative to each other at the pivot between a table-deployment position and a table-storage position. 13. The apparatus of claim 10, wherein: the folding assembly includes: a first folding portion configured to be fixedly connected to the table assembly; anda second folding portion configured to be fixedly connected to the sub-mount assembly; andthe first folding portion and the second folding portion are pivotally connected together at a pivot, and the first folding portion and the second folding portion are configured to be pivotally movable relative to each other at the pivot between a table-deployment position and a table-storage position. 14. The apparatus of claim 1, wherein: the folding assembly includes: a first folding portion configured to be fixedly connected to the table assembly; anda second folding portion configured to be fixedly connected to the sub-mount assembly. 15. The apparatus of claim 14, wherein: the first folding portion and the second folding portion are pivotally connected together at a pivot, and the first folding portion and the second folding portion are configured to be pivotally movable relative to each other at the pivot between a table-deployment position and a table-storage position. 16. The apparatus of claim 14, wherein: the first folding portion and the second folding portion are configured to permit selective foldable movement of the table assembly between a table-deployment position and a table-storage position in response to the folding assembly receiving an application of a force to do just so. 17. The apparatus of claim 1, wherein: instances of the interlocking bracket assembly are spaced apart and are mounted to a table-facing side of the rail-mountable assembly. 18. The apparatus of claim 1, wherein: the rail-mountable assembly defines a set of slots spaced apart from each other and aligned in a row with each other; andeach slot of the set of slots is elongated and is configured to permit accommodation of different types and sizes of the railings of the handrail system. 19. The apparatus of claim 1, wherein: the rail-mountable assembly includes: a coupling nut;a carriage bolt including a shaft portion defining threads configured to mate with the coupling nut, and also includes a flared head portion extending from a shaft portion of the carriage bolt; anda mounting clip defining a hole dimensioned to receive the carriage bolt; andthe mounting clip, the coupling nut and the carriage bolt, in combination, are configured to fixedly connect the rail-mountable assembly to the railings. 20. The apparatus of claim 19, wherein: the carriage bolt is configured to pass through, at least in part, a slot provided by the rail-mountable assembly so that a flared head of the carriage bolt abuts the side of the rail-mountable assembly;the flared head portion of the carriage bolt abuts a table-facing side of the rail-mountable assembly;the shaft portion of the carriage bolt extends through the slot;the mounting clip is positioned on the selected length of the railings;the mounting clip is configured to span across, and abut with, at least two adjacently located instances of the railings;the shaft portion of the carriage bolt extends through the hole of the mounting clip;the coupling nut is threadably connected to the shaft portion of the carriage bolt; andthe coupling nut is turned in such a way that a clamping force is imparted to the mounting clip, and the railings are forcibly clamped or sandwiched between the mounting clip and the rail-mountable assembly.