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Jeff, Yes perhaps you are right that this entire crossing vision will not be part of the first rollout.  I can see the "smart" crossing (diagnostic) concepts being added at the get-go, but not the far ahead sensing of obstruction.  Besides the cost of reliable sensors, there is the problem of separating objects ahead that will move in time from those that won’t.  You can only secure the road so far in advance without unduly disrupting commerce ahead.    I think this first application of PTC will begin an evolution of train operation that basically never ends.  There is a lot of energy expended in developing advanced products to sell to railroads.  The vision is practically unlimited at this point.   You pour diesel fuel in one end and transportation rolls out the other.  Everything in between is up for grabs.
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