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0.017 x total mass = maximum effort (in lbf) required to overcome inertia. Effort required to sustain movement is generally 0.35 x effort to overcome inertia e.g.,

250 lb (113 kg) mass x 0.017 = 4.25 lbf (1.9 kg) to overcome inertia
4.25 (1.9 kg) x 0.35 = 1.48 lbf (0.67 kg) to sustain movement

Notes:  The Working Loads are those loads required to reach deflection ratios (Elastic Deformation). The Ultimate Loads (shaded columns) are those loads required to achieve the listed deflection (Plastic Deformation) and intended for comparative use only. They are not intended to be a guideline for actual installations and applications.

Elastic deformation:  This type of deformation is reversible.  Once the forces are removed, the object returns to its original shape.  The elastic range ends when the material reaches its yield strength.  At this point plastic deformation begins.

Plastic deformation: This type of deformation is not reversible.  Once an object reaches this point, it will not return to its original shape.  Plastic deformation ends with the fracture of the material.

Knight Global follows material handling industry standards in determining the capacity ratings for enclosed track overhead workstation crane systems. Each component (e.g. rail, hangers, trolleys,etc.) is individually tested to establish its ultimate failure point. From this number, a safe working load is then assigned to the component. Each rail span length is then tested to determine the maximum single point load required to achieve a predetermined deflection based on a 1:350 ratio (1" of deflection for each 350" of length). The recommended rated capacity chart is based upon single point loading for the listed spans.