In message , asdf
writes
On Sat, 19 Jan 2008 12:44:10 +0000, Edward Cowling London UK wrote:

While we're taking about the Victoria Line can someone fix the computer
to make the breaking less last minute and less fierce. It's the only
line that seems to routinely try to throw everyone on the floor !

Please don't; I'd rather have the faster journey times. More
grab-rails can be installed if necessary.

I'm getting on a bit (brings out violin) and my back doesn't like all
the excitement of the unplanned roller coaster ride the Victoria Line
can be.

Roll on the invention of inertial dampers :-)

--
Edward Cowling "Must go - Got to rub lard on the Cat's boil !"

On 19 Jan, 17:50, Edward Cowling London UK
wrote:
In message , asdf
writes

On Sat, 19 Jan 2008 12:44:10 +0000, Edward Cowling London UK wrote:

While we're taking about the Victoria Line can someone fix the computer
to make the breaking less last minute and less fierce. It's the only
line that seems to routinely try to throw everyone on the floor !

Please don't; I'd rather have the faster journey times. More
grab-rails can be installed if necessary.

I'm getting on a bit (brings out violin) and my back doesn't like all
the excitement of the unplanned roller coaster ride the Victoria Line
can be.

Roll on the invention of inertial dampers :-)


Fair enough, I see your point - and yes, I suppose the Victoria line
can be a bit jerky. Perhaps the new stock on the upgraded line will
manage to do the job in a smoother manner, without sacrificing the
speed.

On 19 Jan, 17:48, Edward Cowling London UK
wrote:
In message 01c85aae$d37aaa20$LocalHost@default, Michael R N Dolbear
writes



Edward Cowling London UK wrote

While we're taking about the Victoria Line can someone fix the
computer
to make the breaking less last minute and less fierce. It's the only
line that seems to routinely try to throw everyone on the floor !

Huh ?

Whereabouts is this ?

I have never noticed anything out of the way (compared with Pic or
Northern line) but I usually travel Vauxhall to Highbury & Islington
outwards and Kings+ to Oxford Circus inwards.

Hi fellow brother of the damned, I do the same awful route :-) I've
lost track of the times I've started to move towards the doors, only to
have the train stop dead and chuck me about. I don't get this on the
Piccadilly line.

Plus the trains don't wait at the platform like the human driven trains
do if there is a bad morning with the trains up ahead. They just stop in
the bloody tunnel.

All in all give me a human being at the wheel any day.



But I doubt human beings could deliver a line with the same frequency
of trains, which is one of the major attractions of the Victoria line.
Plus of course if all the trains stayed in the platforms if the line
ahead was congested, then the whole line would slow to a crawl. The
train needs to vacate the platform to allow the one behind it in, and
by so doing the service can recover quicker than it would otherwise.
Most of the time they don;t stop in the tunnel for that long.

I'm a big fan of the Victoria line, it is a backbone of the network
and shifts a huge number of people around town quickly. Getting from
Highbury & Islington to Vauxhall in about 15 minutes isn't that far
short of black magic in my book!

On Sat, 19 Jan 2008 10:13:13 -0800 (PST), Mizter T wrote:

I'm getting on a bit (brings out violin) and my back doesn't like all
the excitement of the unplanned roller coaster ride the Victoria Line
can be.

Roll on the invention of inertial dampers :-)

Fair enough, I see your point - and yes, I suppose the Victoria line
can be a bit jerky. Perhaps the new stock on the upgraded line will
manage to do the job in a smoother manner, without sacrificing the
speed.

That seems perfectly possible - they could lower the rate of change of
deceleration, without significantly sacrificing the magnitude of the
deceleration.

On Sat, 19 Jan 2008 17:48:17 +0000, Edward Cowling London UK wrote:

Hi fellow brother of the damned, I do the same awful route :-) I've
lost track of the times I've started to move towards the doors, only to
have the train stop dead and chuck me about. I don't get this on the
Piccadilly line.

Plus the trains don't wait at the platform like the human driven trains
do if there is a bad morning with the trains up ahead. They just stop in
the bloody tunnel.

All in all give me a human being at the wheel any day.

It's still a human being that presses the buttons to close the doors
and start the train moving.

On Sat, 19 Jan 2008 17:02:33 +0000, Edward Cowling London UK
wrote:

In message , Paul Corfield
writes

While we're taking about the Victoria Line can someone fix the computer
to make the breaking less last minute and less fierce. It's the only
line that seems to routinely try to throw everyone on the floor !

Unlikely to be the computer itself. Either a fault with a particular
train or a failure of a signalling / control component at one particular
location.

No. I travel on most of the lines and the Victoria Line had definite
"jump on the anchors" problems. I now lean against the glass partition
until the train has come to a complete standstill. It's far to
consistent to be just an isolated thing. Mind you isn't the Victoria
line the only line where humans don't do the driving ? There might be
the problem !

Central Line is fully automatic (as is DLR). The only tube line in
London where trains seem to accelerate into platforms and then perform a
rather neat stop. It's also far faster now that it used be with driver
control on either the current stock or the 62 stock.
--
Paul C


Admits to working for London Underground!

In message , asdf
writes
On Sat, 19 Jan 2008 17:48:17 +0000, Edward Cowling London UK wrote:

Hi fellow brother of the damned, I do the same awful route :-) I've
lost track of the times I've started to move towards the doors, only to
have the train stop dead and chuck me about. I don't get this on the
Piccadilly line.

Plus the trains don't wait at the platform like the human driven trains
do if there is a bad morning with the trains up ahead. They just stop in
the bloody tunnel.

All in all give me a human being at the wheel any day.

It's still a human being that presses the buttons to close the doors
and start the train moving.

That's like calling the guy in the space capsule a pilot :-)

Say what you like, but the trains always felt safer and seemed to run
better when they had a driver and a guard.

--
Edward Cowling "Must go - Got to rub lard on the Cat's boil !"

In message , asdf
writes
On Sat, 19 Jan 2008 10:13:13 -0800 (PST), Mizter T wrote:

I'm getting on a bit (brings out violin) and my back doesn't like all
the excitement of the unplanned roller coaster ride the Victoria Line
can be.

Roll on the invention of inertial dampers :-)

Fair enough, I see your point - and yes, I suppose the Victoria line
can be a bit jerky. Perhaps the new stock on the upgraded line will
manage to do the job in a smoother manner, without sacrificing the
speed.

That seems perfectly possible - they could lower the rate of change of
deceleration, without significantly sacrificing the magnitude of the
deceleration.

Hmm the flagon with the dragon holds the brew that is true, and the
vessel with the pestle ..........

You have to be a Danny Kaye fan.

--
Edward Cowling "Must go - Got to rub lard on the Cat's boil !"

"Edward Cowling London UK" wrote in message
...
In message 01c85aae$d37aaa20$LocalHost@default, Michael R N Dolbear

Hi fellow brother of the damned, I do the same awful route :-) I've lost
track of the times I've started to move towards the doors, only to have
the train stop dead and chuck me about. I don't get this on the
Piccadilly line.

Plus the trains don't wait at the platform like the human driven trains do
if there is a bad morning with the trains up ahead. They just stop in the
bloody tunnel.

All in all give me a human being at the wheel any day.


At least that way they can steer if there is a derailment - see Mr Branson
for details...

Paul S

On Sat, 19 Jan 2008, asdf wrote:

On Sat, 19 Jan 2008 10:13:13 -0800 (PST), Mizter T wrote:

I'm getting on a bit (brings out violin) and my back doesn't like all
the excitement of the unplanned roller coaster ride the Victoria Line
can be.

Roll on the invention of inertial dampers :-)

Fair enough, I see your point - and yes, I suppose the Victoria line
can be a bit jerky. Perhaps the new stock on the upgraded line will
manage to do the job in a smoother manner, without sacrificing the
speed.

That seems perfectly possible - they could lower the rate of change of
deceleration, without significantly sacrificing the magnitude of the
deceleration.

You beat me to it! The rate of change of acceleration [1] is known as
'jerk rate', and it's primarily that, rather than the magnitude of the
acceleration, which determines passenger comfort. Well, until the
acceleration is a significant fraction of gravity, but i don't think we're
likely to see that - normal braking is usually on the order of 1 m/s^2, i
think. You can indeed reduce the jerk rate while maintaining the same
deceleration; it means it'll take a little longer to come up to full
braking, but the extra time is negligible compared to the time then spent
at full brake. The jerk rate is entirely limited by the sophistication of
the control system, i believe; the primitive computers on the current
Victoria line trains probably don't make any attempt to control it, and
just switch between acceleration rates as quickly possible. I'd hope the
new stock makes more effort here.

tom

[1] The fourth derivative of position with respect to time - fourth!

--
There is no latest trend.