Platform levels
 

On 2016-02-25 16:05:52 +0000, d said:

Because the loading gauge at platform level is about a foot narrower
than about a foot above it, also because space is needed under the
floor for engines and similar equipment on a modern MU.

Whats that got to do with making the platforms the same height as the train
floor?

The reason why the train is about a foot narrower at platform height is
because of the protrusion of the platform.

Neil
--
Neil Williams
Put my first name before the @ to reply.

Platform levels
 

Neil Williams wrote:
On 2016-02-25 16:05:52 +0000, d said:

Because the loading gauge at platform level is about a foot narrower
than about a foot above it, also because space is needed under the
floor for engines and similar equipment on a modern MU.

Whats that got to do with making the platforms the same height as the train
floor?

The reason why the train is about a foot narrower at platform height is
because of the protrusion of the platform.

I think that's the wrong way of putting it. If the platform was at the
same height as the train floor, and of a width to just clear the train,
it's irrelevant how much narrower the train is lower down. So the platforms
need to be higher and slightly narrower. The short humps on a growing
number of Tube platforms illustrate where the whole platform should be.

The new S stock did it the other way: the trains have a lower floor, and
are narrower at that level to clear the existing platforms. That's also the
approach taken by many Continental low floor trains.

Platform levels
 

On 25.02.16 12:23, Recliner wrote:
On Thu, 25 Feb 2016 12:11:17 +0000 (UTC), d wrote:

On Thu, 25 Feb 2016 05:33:50 -0600
wrote:
In article , d () wrote:

Why is it in this country - and elsewhere in europe it has to be said -
that we really don't like building platforms that are level with the train
floor? There's always a step up. This is understandable on curved
platforms where the gap would be an issue, but on dead straight ones there
is no excuse yet they're still lower. Only recently have we started
building them level. Even the 1960s Victoria line tube suffers from
platforms lower than the train floor
other than on short sections where LU has raised them.

The S Stock has changed that of course.

Up to a point. Though it brings its own problems - the gap at the highly
curved Aldgate platforms is borderline dangerous for anyone with poor
eyesight.

Have they installed the bright below-platform lights there, as at
other curved platforms? That would help people not fail to spot, and
fall into, the gap. I also think the mind-the-gap announcements be
limited to those stations where there is a dangerously large gap.

But I think that's your answer: it was deemed to be safer to overhang
platforms than to be at the identical level with a large gap on curved
platforms. And presumably on general purpose lines all trains aren't
the same height anyway, so you'd have had both a gap and a height
difference.

I looked at the pics I took in Japan and see that even on recent
Shinkansen lines, the train floors are a bit higher than the platform,
though the height difference is quite small, and there's almost no
gap:
https://www.flickr.com/photos/reclin...1720/lightbox/


Have they ever used gap fillers in London, similar to what they have at
three stations on the New York City Subway?

I thought that there were a couple of stations with them here.

Platform levels
 

On Thu, 25 Feb 2016 19:05:16 +0000 (GMT+00:00)
Recliner wrote:
Wrote in message:
On Thu, 25 Feb 2016 12:23:09 +0000
Recliner wrote:
On Thu, 25 Feb 2016 12:11:17 +0000 (UTC), d wrote:
Up to a point. Though it brings its own problems - the gap at the highly
curved Aldgate platforms is borderline dangerous for anyone with poor
eyesight.

Have they installed the bright below-platform lights there, as at
other curved platforms? That would help people not fail to spot, and

Can't remember TBH, its been a few months since I last went there.

I went through Aldgate today, and the platforms didn't seem
especially curved. Finchley Road, where a lot of people change
trains, has much bigger gaps.

Its more the centre platforms where the met line trains terminate that
the problem occurs.

--
Spud

Platform levels
 

On Thu, 25 Feb 2016 23:25:02 +0000
Neil Williams wrote:
On 2016-02-25 16:05:52 +0000, d said:

Because the loading gauge at platform level is about a foot narrower
than about a foot above it, also because space is needed under the
floor for engines and similar equipment on a modern MU.

Whats that got to do with making the platforms the same height as the train
floor?

The reason why the train is about a foot narrower at platform height is
because of the protrusion of the platform.

So shave the platforms back and raise them. Whats the big deal?

--
Spud

Platform levels
 

wrote:
On Thu, 25 Feb 2016 23:25:02 +0000
Neil Williams wrote:
On 2016-02-25 16:05:52 +0000, d said:

Because the loading gauge at platform level is about a foot narrower
than about a foot above it, also because space is needed under the
floor for engines and similar equipment on a modern MU.

Whats that got to do with making the platforms the same height as the train
floor?

The reason why the train is about a foot narrower at platform height is
because of the protrusion of the platform.

So shave the platforms back and raise them. Whats the big deal?

That's effectively what the raised short humps on many Tube platforms do.