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<p>[quote user="Falcon48"]</p> <p> </p> <div class="quote-header"> </div> <blockquote class="quote"> <div class="quote-user">Overmod</div> <div class="quote-content"> <p> </p> <div class="quote-header"> </div> <blockquote class="quote"> <div class="quote-user">Falcon48</div> <div class="quote-content">They were using some sort of jigs on the surface above the rails and the pavement, the purpose of which wasn't entirely clear. I'm pretty familiar with track construction techniques on regular railroads, but I had never seen anthing like this. My guess was that they were jacking up the track structure from above to level it, since they were also injecting some kind of material (possibly a slurry) into the track structure.</div> </blockquote> <div class="quote-footer"> </div> <p> </p> <p>This sounds like top-down alignment to me.  Does <a title="http://books.google.com/books?id=04z0Lw1qKiIC&pg=SA4-PA105&lpg=SA4-PA105&dq=top-down+rail+track+alignment&source=bl&ots=rO9l-RXqDY&sig=QMerzlQJ_aG0WcW004x6s2Ew3YY&hl=en&sa=X&ei=W0dlVKfSIJOAygTdoICoCQ&ved=0CDoQ6AEwBw#v=onepage&q=top-down%20rail%20track%20alignment&f=false" href="http://books.google.com/books?id=04z0Lw1qKiIC&pg=SA4-PA105&lpg=SA4-PA105&dq=top-down+rail+track+alignment&source=bl&ots=rO9l-RXqDY&sig=QMerzlQJ_aG0WcW004x6s2Ew3YY&hl=en&sa=X&ei=W0dlVKfSIJOAygTdoICoCQ&ved=0CDoQ6AEwBw#v=onepage&q=top-down%20rail%20track%20alignment&f=false" target="_blank">anything here look like what you saw?</a></p> <p> </p> <p>Edit:  Here is a video of some of the rail-replacement activity:</p> <p><iframe src="http://www.youtube.com/embed/QtDSSg0TVFI" width="425" height="350"></iframe></p> <p> </p> <div style="clear:both;"> </div> <p> </p> </div> </blockquote> <div class="quote-footer"> </div> <p> </p> <p> This is exactly what I saw.  Note that, in this picture, the rail seems to be still in place. [/quote]</p> <p>Fantastic!  Whatever I was going to do tomorrow is on hold.  I am off to Dallas to see some of the action in person.</p>
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