wrote:

Geography? Have you looked where Terminals 4 and 5 actually are?


Thanks for that informative reponse.

Are the terminals really so far apart that a three station loop would
have been impractical? It just seems a more logical service pattern
than some loop, some terminating.

Look at Heathrow on Google Map:
http://maps.google.com/maps?&om=1&z=...+airpo rt,+uk

You can see the new T5 taking shape about 1 ½ mile or someting west of
the T 1-2-3 station.

If you then look at the locations of T1-2-3, T4, T5 and Hatton Cross
stations I think you realize that a big loop through all of the stations
would not be realistic.

But the again you have a point about the service pattern getting far
more complex to the passangers, maybe it would have better to cut of the
south-eastern part of the current loop and drive the T4 trains via
T1-2-3 and then terminating and reversing at T4. That would give
HX-T123-T4 or HX-T123-T5 services, both terminating and reversing out
the same way they got in and easy to read and understand line diagrams.

--
Olof Lagerkvist
ICQ: 724451
Web: http://here.is/olof