Track maintenance for high-speed rail and even for not-so-high-speed rail is already quite expensive without adding a device that will add to the expense. What is the goal of such a device?
Buried in a post on the LA Expo line, made by MikeF90, was a link to the GERB company's track isolation system. On another page is information which is also of interest to those discussing the Charlotte light rail system. (Note that you can look at their three basic designs of suspension in the small links at upper right.)
The Germans have a long history of investigating sprung track; I consider this an interesting subject. In the mid-Seventies (to put this in perspective, the heyday of chevron primary springing) I considered some form of sprung-track attenuation to be essential for very-high-speed rail in a number of respects; it's interesting to see the approaches that have been developed, both in track and vehicle design, since that time.
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