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To understand EOT cranes well, one must know the major components and how they interplay. Key design considerations hinge on load, span, travel, duty, environment, safety, and maintainability. 2.1 Structural Elements Bridge / Girder(s) These are the primary load‑carrying elements. A bridge is the whole unit that spans from one runway to the other. The girders may be of different types (rolled sections, fabricated plate sections, box girders) depending on span, load, duty, and other conditions. Single vs Double Girder Single girder EOT cranes: one bridge girder; the hoist runs beneath it. These are lighter, less expensive, for lighter loads and shorter spans. Double girder EOT cranes: two parallel girders; the trolley/hoist may run on top of the girders. Double girder gives higher hook height (i.e. more usable lift height), better structural strength, lower deflection, and ability to handle heavier loads and longer spans.