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1910.179(e)(3)(i)
A trolley shall be provided with bumpers or other automatic means of equivalent effect, unless the trolley travels at a slow rate of speed, or is not operated near the ends of bridge and trolley travel, or is restricted to a limited distance of the runway and there is no hazard of striking any object in this limited distance, or is used in similar operating conditions. The bumpers shall be capable of stopping the trolley (not including the lifted load) at an average rate of deceleration not to exceed 4.7 ft/s/s when traveling in either direction at one-third of the rated load speed.
1910.179(e)(3)(iii)
Bumpers or equivalent shall be designed and installed to minimize parts falling from the trolley in case of age.
1910.179(e)(3)(ii)
When more than one trolley is operated on the same bridge, each shall be equipped with bumpers or equivalent on their adjacent ends.

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