I want to digress. http://www.railfaneurope.net/tgv/images/construction/vdcavignon4.jpg http://www.railfaneurope.net/tgv/images/construction/vdcavig... shows a

I want to digress. http://www.railfaneurope.net/tgv/images/construction/vdcavignon4.jpg http://www.railfaneurope.net/tgv/images/construction/vdcavig... shows a part of TGV track being lifted into place. TGV is cheap high-speed track, particularly if one is willing to leverage the experience the French have built. That seems to be for a bridge, so not cheap, but the width ought to match the usual track width. Would that fit in a road median? It seems implausible. If not, then it's a fair assumption that building something narrower will add to the cost. The French didn't spend extra to build wider than optimal tracks, after all. EDIT: I found http://www.railfaneurope.net/tgv/track.html http://www.railfaneurope.net/tgv/track.html and… wow.