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So therefore, it is fair to say that improvements in safety alone will certainly add profit by reducing the costs associated with wrecks, injuries, and deaths.  And therefore, railroad companies are on a continuous trajectory of improving safety in pursuit of profit by developing and adopting whatever technologies happen to be proven at any given time.  Examples of such technologies leading to safety improvements are the air brake, automatic couplers, ECP brakes, and PTC.  Therefore, because the railroads are already motivated to develop these safety improvements in their own self-interest, no government mandate is needed.  In retrospect, it seems absurd to conclude that railroads would have failed to convert to standards such as the air brake or automatic couplers.  By extension, it seems equally absurd to conclude that railroads will not develop PTC without a government mandate.
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