rob499

On 17 Jul, 14:28, Sam Wilson <Sam.Wil...@ed.ac.uk> wrote:
> In article <431247c04f%R...@greywall.>,
>  Graeme Wall <R...@greywall.> wrote:
>
> > In message <tmr88jrp7n00.yzx4cobed7a4....@40tude.net>
> >           Chris  Tolley <cj...@supanet.com> wrote:
>
> > > IRL, of course, things are rarely as black and white as that, so the
> > > layout will be designed to optimise the number of conflicting movements,
> > > which is one reason why rail layouts are sometimes redesigned when
> > > service patterns change.
>
> > While I'm sure we all suspect there are layouts specifically designed to
> > optimise conflicting movements the intention is usually to minimise them :-)
>
> The pedant in me has to point out that "optimise" does not necessarily
> mean "maximise"...  :-)
>
> Sam

What nobody has pointed out yet is that when a main line is built as a
2-track railway and then widened to a 4-track (as happened on the
Great Western, for example), pairing by use is much easier than
pairing by direction.

Rob.