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Thank you for your comments Paul.  That is an interesting point about the interlocking being capable of taking a route away once given.  I don’t know if there are exceptions to this, but my understanding of interlocking plants correlates to what Jeff has mentioned above.  That is, that a route can be taken away from an approaching train, but it cannot be taken away and replaced by a conflicting route.  Specifically, once a train enters a plant that is lined for it, if the route is taken away, the plant locks up.  This prevents a conflicting route from being lined up, which might lead to a collision course.     <o:p></o:p> I did read that article in Trains about the wreck that couldn’t happen.  In that case, a technical fault with the interlocking plant allowed it to grant two conflicting routes, which should normally be impossible with a properly operating plant.  Wasn’t there some redesign of the track routes underway there that required a revision of the interlocking plant?  I seem to recall that the technical fault accidentally introduced in that plant remodeling.  <o:p></o:p> Regarding the OV-8, my point in mentioning the possible loss of a signal on approach is to address a possible argument that the engineer was momentarily distracted by the operator’s verbal highball, and that that was sufficient to miss the signal.  In fact, the engineer and the fireman were both required by the rules to watch that signal from the time it came until view until the time they passed it.  In this case that was a span of two minutes.
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