Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
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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