(57) An access tower (1) comprising:
two end frames (2), each comprising a pair of generally vertical stiles (4) connected
by a plurality of generally horizontal rungs (5), the rungs (5) of an end frame (2)
being vertically distributed by a distance X,
at least one advanced guard rail (12) arranged between the two end frames (2), the
advanced guard rail (12) having a frame including a plurality of horizontal members
(13-16) vertically distributed by said distance X, the advanced guard rail further
having a hook (19) provided at each respective corner of the frame, each hook (19)
receiving a respective rung of (5) a respective end frame (2),
wherein the at least one advanced guard rail (12) is arranged between the end frames
(2) such that the horizontal members (13-16) of the advanced guard rail are substantially
aligned with the rungs (5) of the adjacent end frames (2).
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