A catwalk includes a mounting frame or other connection to a side of a vehicle/equipment, a floor, and at least one railing; an actuator system for moving the catwalk enclosure between retracted and deployed positions; and a guide arm for guiding/controlling pivoting of the railing relative to the floor. The actuator system and guide arm are preferably substantially or entirely outside of the catwalk walkway space where a user walks or stands, thereby providing easy access to the walkway at one or both ends and obstacle- and barrier-free passage from one catwalk to another on the same vehicle/equipment. The actuator system prevents the catwalk from collapsing/retracting when a person is on the catwalk, for example, by the lift capacity of a hydraulic or pneumatic cylinder being controlled/tuned so that the cylinder does not have the capacity/capability to lift and retract the catwalk when the catwalk is occupied.
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