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Is the distinction between the highest speed corridors and the lower speed corridors track geometry or the actual layout of the track ... curve radius, etc?

Basically the latter: key factors are minimum curve radius, distance of the two tracks and distance from buildings/walls, switches. But other requirements are: stronger and more tense catenary, special signalling and train control system, and a number of safety measures (like sensors for cars falling off bridges).

To bolster you even further, here is a picture of what someone referred to upthread, a TGV pulled by a diesel on the last leg of the Paris--Les-Sables-d'Olonne journey along a really really conventional track:



*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Mon Mar 26th, 2007 at 05:23:33 PM EST
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