It sounds like an April Fools joke but apparently TfL are considering
it.
http://tinyurl.com/5augle

Presumably if this were to go ahead the line would have to be closed for
an extended period.

Peter Smyth

On 19 Apr, 11:30, "Peter Smyth" wrote:
It sounds like an April Fools joke but apparently TfL are considering
it.http://tinyurl.com/5augle

Presumably if this were to go ahead the line would have to be closed for
an extended period.

It refers to AC motors, which are more efficient than DC motors. AC
motors are driven by chopping up DC power electronically to match the
desired rotation speed, so there's no need to have the traction
current be AC. The Jubilee and Northern stock already has AC motors,
as do Networkers and most if not all newer EMUs.

U

--
http://londonconnections.blogspot.com/
A blog about transport projects in London

In message , at 11:30:49 on Sat,
19 Apr 2008, Peter Smyth remarked:
It sounds like an April Fools joke but apparently TfL are considering
it.
http://tinyurl.com/5augle

Presumably if this were to go ahead the line would have to be closed
for an extended period.

And would the AC motors fall off the bogies less often than the DC ones?
--
Roland Perry

In article ,
Peter Smyth wrote:
It sounds like an April Fools joke but apparently TfL are considering
it.
http://tinyurl.com/5augle

I'm not sure why you think it might be a april fools joke: both the '95 and
'96 stock have AC traction packages.

Presumably if this were to go ahead the line would have to be closed for
an extended period.

Change the traction package on a unit, and put it back in service.
Don't see why that would require closing the line. It might not
be possible to couple a DC unit and an AC unit in a single train,
but they can certainly share the same track and power rails.

--
Shenanigans! Shenanigans! Best of 3!
-- Flash

On Sat, 19 Apr 2008, Mike Bristow wrote:

In article ,
Peter Smyth wrote:
It sounds like an April Fools joke but apparently TfL are considering
it.
http://tinyurl.com/5augle

I'm not sure why you think it might be a april fools joke: both the '95 and
'96 stock have AC traction packages.

Presumably if this were to go ahead the line would have to be closed for
an extended period.

Change the traction package on a unit, and put it back in service. Don't
see why that would require closing the line. It might not be possible
to couple a DC unit and an AC unit in a single train, but they can
certainly share the same track and power rails.

I think Peter thought, as i did, that this meant converting the power
supply to AC. Possibly by somehow stringing up cables in the tunnels.
Which does sound like it could take a while.

tom

--
But for [Flavor Flav's] "YEAAAAAAAAAAAAAH BOYYYYYYYYYY"s alone he should
be given Rap Legend status. -- Nate Patrin, ILX

"Mr Thant" wrote in message
...
On 19 Apr, 11:30, "Peter Smyth" wrote:
It sounds like an April Fools joke but apparently TfL are considering
it.http://tinyurl.com/5augle

Presumably if this were to go ahead the line would have to be closed
for
an extended period.

It refers to AC motors, which are more efficient than DC motors. AC
motors are driven by chopping up DC power electronically to match the
desired rotation speed, so there's no need to have the traction
current be AC. The Jubilee and Northern stock already has AC motors,
as do Networkers and most if not all newer EMUs.

Thanks - it makes a lot more sense now.

Peter Smyth

Tom Anderson wrote:

I think Peter thought, as i did, that this meant converting the power
supply to AC. Possibly by somehow stringing up cables in the tunnels.
Which does sound like it could take a while.

.... but was planned for the Victoria Line a few years ago.

In article , (Roland
Perry) wrote:

In message , at 11:30:49 on
Sat, 19 Apr 2008, Peter Smyth remarked:
It sounds like an April Fools joke but apparently TfL are considering
it.
http://tinyurl.com/5augle

Presumably if this were to go ahead the line would have to be closed
for an extended period.

And would the AC motors fall off the bogies less often than the DC
ones?

They tend to be lighter, so probably.

--
Colin Rosenstiel

Tom Anderson wrote:

I think Peter thought, as i did, that this meant converting the power
supply to AC.

And here I was thinking they were going to air condition the Central Line...

On 19 Apr, 16:36, "John Rowland"
wrote:
Tom Anderson wrote:

I think Peter thought, as i did, that this meant converting the power
supply to AC. Possibly by somehow stringing up cables in the tunnels.
Which does sound like it could take a while.

... but was planned for the Victoria Line a few years ago.

The space train I want one. A missed oppertunity if there ever was
one.