The tubular portion has open ends at opposite ends of the rail and a rung-supporting portion integrally formed as one piece with the tubular portion and depending therefrom. Each of the first and second rails has a tubular portion forming a hollow beam extending the length of the rail. Each cable tray section includes first and second rails extending lengthwise of the section at opposite sides of the section and a plurality of rungs extending between the rails at intervals spaced lengthwise of the section. A ladder-type cable tray system comprising a first cable tray section and a second cable tray section.
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