 Fast / Slow Line Layout
I don’t think anyone’s mentioned yet that an important consideration
is the extent to which four tracks are being provided.
Paired by use doesn’t lend itself to sections of railway where, for
whatever reason, it is necessary to revert to just two tracks. One
immediately thinks of Hadley Wood Tunnel on the ECML paired by use, on
aproach to there, would be a nightmare
The LNWR is an interesting example of horses for courses.
Euston to Rugby is paired by use, as four tracks are available
throughout, yet the Trent Valley line north thereof is paired by
direction (believe will still be the case after upgrade), due to the
need to revert to just two tracks at various points.
Similarly, I believe the LNWR elected to pair by direction on the now
defunct four track sections of the North Wales main line for the same
reason.
|