"Ben Nunn" wrote in message
...
Or will it be one platform be for T5 only, and the other for
both sets of London-bound trains? (which would make more sense
to the traveller, but be logistically more difficult to implement,
and result in a bizarre station where twice as many trains went
in one direction as t'other.)

Based on the plans, it would appear to be the above. Wouldn't be that
difficult to implement; the T123-T5 trains would be completely separate from
the T5-T123-CL & T4-T123-CL trains, the only conflict would be the
convergence between the latter two.

I presume that there will be some flexibility retained to allow trains to
reverse at T123, and possibly run trains from T4 into Platform 1 like they
do now.

So how will that work with the two platforms at T123? Will one be used
exclusively for London-bound trains that have gone round the loop, and the
other for bi-directional trains on a single track extension to T5?

That would prevent any T5 bound train entering the T123 platform until a
London bound train had cleared the extension and T123. That doesn't sound
very promising.

It would also be very confusing for passengers wanting to transfer to T5.

Or will it be one platform be for T5 only, and the other for both sets of
London-bound trains? (which would make more sense to the traveller, but be
logistically more difficult to implement, and result in a bizarre station
where twice as many trains went in one direction as t'other.)

That sounds more likely to me. It doesn't sound like it would be
logistically any more difficult. After all for the loop things would be
much the same and for the T5 link it just shifts the changeover from double
track to single track running to the other side of T123. It would also mean
a train could wait in T123 and head for T5 as soon as there the branch is
clear rather than waiting for T123 to be cleared too.

I don't think too many people would find the situation very bizarre.
Whenever I am at a waiting at a station there always seems to be twice as
many trains going the other way :-)

In article , Ben Nunn
writes
Or will it be one platform be for T5 only, and the other for both sets of
London-bound trains? (which would make more sense to the traveller, but be
logistically more difficult to implement, and result in a bizarre station
where twice as many trains went in one direction as t'other.)

Provided that the junction with the loop doesn't involve a flat
crossover, it will be extremely easy to implement; easier than your
other proposal. Trains from Hatton Cross go into the southern platform
and leave to the west, trains from the west go into the northern
platform and leave to the east. One converging and no conflicting
movements.

There are lots of stations with many more departures in one direction
than the other. For example, Peterborough, Cambridge, Queen's Park,
Harrow & Wealdstone, Watford Junction, Kennington, Baker Street (Main),
Whitechapel, Edgware Road, Aldgate, ....

The only new thing is that there aren't any "all change" trains
arriving.

--
Clive D.W. Feather | Home:
Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org
Fax: +44 870 051 9937 | Work:
Please reply to the Reply-To address, which is:

"Graham J" wrote in message ...
I don't think too many people would find the situation very bizarre.
Whenever I am at a waiting at a station there always seems to be twice as
many trains going the other way :-)

I realise it would involve more tunneling and hence be more expensive but
surely a better solution would be to have trains go either HX - T123 - T5
or HX - T4 - T5? Obviously due to the single track at T4 they would then
all have to return T5 - T123.

B2003

"Ben Nunn" wrote in message

"Peter Smyth" wrote in message
...

If one loop goes HX-T4-T123-HX and the other goes HX-T123-T5-HX,
then the diagram will need to resemble a pair of testicles at the
end of the line, no?

T5 will not be on a loop. Some trains will go HX-T4-T123-HX as now
and the others will go HX-T123-T5(reverse)-T123-HX


So how will that work with the two platforms at T123? Will one be used
exclusively for London-bound trains that have gone round the loop,
and the other for bi-directional trains on a single track extension
to T5?

Or will it be one platform be for T5 only, and the other for both
sets of London-bound trains? (which would make more sense to the
traveller, but be logistically more difficult to implement, and
result in a bizarre station where twice as many trains went in one
direction as t'other.)

I had assumed that it was a double tunnel from T123 to T5, with two
platforms at T5. I don't think a single tunnel could maintain the
required service frequency.

The T4 loop would connect with the eastbound (northern) tunnel just
before the T123 station. To do this, the rebuilt loop will presumably
have to dive under the west-bound (and maybe both) tunnel, whereas the
current version is on the level -- hence the long closure.

Clive D. W. Feather ) sucked my cock,
and then posted this ):

There are lots of stations with many more departures in one direction
than the other. For example, Peterborough, Cambridge, Queen's Park,
Harrow & Wealdstone, Watford Junction, Kennington, Baker Street
(Main), Whitechapel, Edgware Road, Aldgate, ....


The only new thing is that there aren't any "all change" trains
arriving.


Well quite. All of the above are multiple platform stations at which some
services from one direction terminate.

AFAIK, The new Heathrow 123 will be the only 'conventional' LUL through
station (e.g. one 'up' platform and one 'down') from which the number of
trains in each direction is unequal.

BTN

"Ben Nunn" wrote in message
...

AFAIK, The new Heathrow 123 will be the only
'conventional' LUL through station (e.g. one 'up'
platform and one 'down') from which the number
of trains in each direction is unequal.

Many LUL stations have unequal services at certain times of the day, and not
just at the beginning and end of the day.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes

Well quite. All of the above are multiple platform stations at which some
services from one direction terminate.

AFAIK, The new Heathrow 123 will be the only 'conventional' LUL through
station (e.g. one 'up' platform and one 'down') from which the number of
trains in each direction is unequal.


Slonebridge Park & Harlesden have unequal numbers of LUL trains in
passenger service serving them...

Ben Nunn wrote:
AFAIK, The new Heathrow 123 will be the only 'conventional' LUL
through station (e.g. one 'up' platform and one 'down') from which
the number of trains in each direction is unequal.

Is that in some way important or significant? If so I'd be intrigued to
learn.

In article ,
Steve Fitzgerald ] wrote:
In message , Martin
Whelton writes
Do we know when construction work is due to start on the Piccadilly
extension to Terminal 5 as I understand that tunneling work was due to
be finished by next year. I also understand that Terminal 4 would be
temporaily closed during the construction period.

Tunnelling is well under way and I believe the station box is all but
finished.

Plans are advanced for the closure of the T4 loop to allow the T5
extension to be connected. I think the latest plan is around December.
I'll try and confirm today at work, but I think we're looking at about a
two year closure.

The latest edition of Rail implies that the the first Picadilly line
tunnel between T123 and T5 is already complete and the second tunnel is
about to start. Both Picadilly line and HEX will have twin track
connections to T5 with two platforms at T5 for each service and an option
of two further platforms for HEX. There is also an implication (it is not
entirely clear in the article) that HEX trains will serve T123 and T5
only. The plan to split HEX trains at T123 into T4 and T5 portions seems
to have been abandoned. Also the new Paddington-Heathrow stopping service
"Heathrow Connect" will turn round at T123 when it starts next year (ie it
will not serve T4). It will eventually be extended to T5. So it looks like
T4 will not be seeing many trains !

David