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It is easy to conclude that the PTC mandate was necessary because the railroads have not installed PTC voluntarily.  However, they cannot implement something until after it has been developed, and the development of PTC is not yet complete. So there is no basis to conclude that the railroads have been remiss, negligent, or careless in not yet installing PTC. The PTC mandate is more than just an order to install PTC.  More significantly, it is a mandate to develop PTC, using the forced implementation on the operating railroads as a development laboratory, at the railroads’ cost.  And as is the case of all research and development, the total cost has no known limit.  And like all massive projects, the more you spend, the harder it is to back out of it.  And also, like all massive projects, proponents lowball the initial estimates because they know that once the project moves forward, it becomes harder and harder to back out of it.
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