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My focus above is on branch/main line junctions, rather than main/main line junctions, and branch/main junctions should be designed so that through services run through without switching. And this being the US, on a switch onto the end of the branch line (if the branch is to be accessed two-way, this is on the other side of the flyover, not in the main corridor)

So:

  • pull the main line alignment apart to allow a central track;
  • have the switching loop branch off one of the two main lines;
  • have the other main line switch onto that; and
  • fly the switching loop out of the main line corridor.

There is at least one switch on the branch line end, more if its a dual-track line or a t-intersection for access in both directions. If its a two-way Express alignment, then it would have the identical alignment on that end, so four switches total to interconnect the HSR corridor with a two way Express alignment. Add two more switches if a standing loop is required on the interconnection line.


I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.
by BruceMcF (agila61 at netscape dot net) on Mon Mar 26th, 2007 at 11:12:42 AM EST
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