The utility model relates to a structural assembly used for a platform railing of a fiber web machine. The structural assembly serves as a handrail (11) of the railing (10), and comprises a beam (11) which is homogeneous, slender and hollow inside and an insertion groove (13) formed in the beam (12). The handrail (11) can be installed on a railing wall plate (14) through the insertion groove. The beam (12) is open on the cross section, and therefore the handrail (11) can be fixed to the railing wall plate (14) through the insertion groove (13). The utility model further relates to the platform railing and a platform.
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