In article
,
(Offramp) wrote:

One of the runsoff of fare evasion is that these two-step lifts are
thought necessary.

An in extremis example is at Westminster. There is no lift from the
street to the platforms; that would mean by-passing the ticket gates.
So there is a lift from the street to the ticket office level - one of
the shallowest lifts in London, I would think. It has the depth of
about a dozen steps. There is a similar sort of thing at the Borough
High St exit at London Bridge.

I suspect the Westminster height is more typical than you realise. From
street to ticket hall is a common lift requirement.

--
Colin Rosenstiel

On 2011\05\13 11:43, wrote:
In article
,
(Offramp) wrote:

One of the runsoff of fare evasion is that these two-step lifts are
thought necessary.

An in extremis example is at Westminster. There is no lift from the
street to the platforms; that would mean by-passing the ticket gates.
So there is a lift from the street to the ticket office level - one of
the shallowest lifts in London, I would think. It has the depth of
about a dozen steps. There is a similar sort of thing at the Borough
High St exit at London Bridge.

I suspect the Westminster height is more typical than you realise. From
street to ticket hall is a common lift requirement.

If the lift had doors on two sides and sensors to detect people within,
a single lift could link the street, the ticket hall and the platforms
without compromising the barrier line.

"Basil Jet" wrote:

On 2011\05\13 11:43, wrote:

(Offramp) wrote:

One of the runsoff of fare evasion is that these two-step lifts are
thought necessary.

An in extremis example is at Westminster. There is no lift from the
street to the platforms; that would mean by-passing the ticket gates.
So there is a lift from the street to the ticket office level - one of
the shallowest lifts in London, I would think. It has the depth of
about a dozen steps. There is a similar sort of thing at the Borough
High St exit at London Bridge.

I suspect the Westminster height is more typical than you realise. From
street to ticket hall is a common lift requirement.

If the lift had doors on two sides and sensors to detect people within,
a single lift could link the street, the ticket hall and the platforms
without compromising the barrier line.


With doors opening alternate sides I suppose.

On 2011\05\13 12:54, Mizter T wrote:

"Basil Jet" wrote:

On 2011\05\13 11:43, wrote:

(Offramp) wrote:

One of the runsoff of fare evasion is that these two-step lifts are
thought necessary.

An in extremis example is at Westminster. There is no lift from the
street to the platforms; that would mean by-passing the ticket gates.
So there is a lift from the street to the ticket office level - one of
the shallowest lifts in London, I would think. It has the depth of
about a dozen steps. There is a similar sort of thing at the Borough
High St exit at London Bridge.

I suspect the Westminster height is more typical than you realise. From
street to ticket hall is a common lift requirement.

If the lift had doors on two sides and sensors to detect people
within, a single lift could link the street, the ticket hall and the
platforms without compromising the barrier line.


With doors opening alternate sides I suppose.

The lift would have two modes, streetside and airside, and could only
switch between the two when empty. On the ticket hall level the mode
would control which of the two doors opened.

In message , at 13:00:34 on
Fri, 13 May 2011, Basil Jet remarked:
If the lift had doors on two sides and sensors to detect people
within, a single lift could link the street, the ticket hall and the
platforms without compromising the barrier line.

With doors opening alternate sides I suppose.

The lift would have two modes, streetside and airside, and could only
switch between the two when empty. On the ticket hall level the mode
would control which of the two doors opened.

And I predict it would spend most of its time full of people wanting the
opposite mode to that which it was currently performing, and refusing to
get out.
--
Roland Perry

On 2011\05\13 13:30, Roland Perry wrote:
In message , at 13:00:34 on
Fri, 13 May 2011, Basil Jet remarked:
If the lift had doors on two sides and sensors to detect people
within, a single lift could link the street, the ticket hall and the
platforms without compromising the barrier line.

With doors opening alternate sides I suppose.

The lift would have two modes, streetside and airside, and could only
switch between the two when empty. On the ticket hall level the mode
would control which of the two doors opened.

And I predict it would spend most of its time full of people wanting the
opposite mode to that which it was currently performing, and refusing to
get out.

It's theoretically possible that one mode could hog the lift, but I
don't think any lift on LU is busy enough for that to happen, except at
the lift-only stations such as Covent Garden.

The other way to exploit one shaft and motor would be to attach two lift
cages on top of each other, with the top one streetside and the bottom
one airside. If the distance between the two cages was the same as the
distance from street to ticket hall, they could both load simultaneously
at the top, although they'd need to load separately at the bottom. That
way neither mode can hog the lift, but people would often be in a
stopped lift with the doors shut.

In message , at 14:29:52 on
Fri, 13 May 2011, Basil Jet remarked:

The other way to exploit one shaft and motor would be to attach two
lift cages on top of each other, with the top one streetside and the
bottom one airside. If the distance between the two cages was the same
as the distance from street to ticket hall, they could both load
simultaneously at the top, although they'd need to load separately at
the bottom.

I've never seen that lift configuration, possibly because one lift's
occupants will assume they are trapped when the lift stops without the
doors opening.
--
Roland Perry

In article , (Roland
Perry) wrote:

In message , at 13:00:34
on Fri, 13 May 2011, Basil Jet
remarked:
If the lift had doors on two sides and sensors to detect people
within, a single lift could link the street, the ticket hall and the
platforms without compromising the barrier line.

With doors opening alternate sides I suppose.

The lift would have two modes, streetside and airside, and could only
switch between the two when empty. On the ticket hall level the mode
would control which of the two doors opened.

And I predict it would spend most of its time full of people
wanting the opposite mode to that which it was currently
performing, and refusing to get out.

Never mind all the operating complexity, just think where the lifts go.
Those in Westminster are some way apart.

--
Colin Rosenstiel

On May 14, 1:44*am, wrote:

In article ,
(Roland Perry) wrote:

Never mind all the operating complexity, just think where the lifts go.
Those in Westminster are some way apart.

They should of course be designed to surface just behind the Speaker's
chair.

In message , Basil Jet
wrote:
If the lift had doors on two sides and sensors to detect people within,

I believe most lifts do, based on the tension in the cable.

--
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