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  There is another reason to conclude that the coupler mandate may not have been necessary to complete the conversion within seven years.  By the time of the 1893 mandate, the 20% conversion was possibly sufficient to propel the industry forward to completion as quickly as possible.  The reason this may have been the case was that the conversion phase required coupling MCB couplers to link and pin couplers, which caused more accidents and delays than the most dangerous period of the link and pin phase.  So once they had a sufficient number of cars converted, this mating of the differing coupler types grew into a formidable problem, creating a strong incentive to get the conversion job done.
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