wrote in message
oups.com
Thunderbug wrote:
What is the motor-type noise that comes from under trains on the Met
line? It's obviously something that spins around but it doesn't seem
to be related to propelling the train?

I think it is the air compressors for the brakes and doors ( I have
read something about this before ).

All Underground trains have air compressers, but they are particularly
noisy on the elderly A stock. I can't remember if they're on all the
cars, or just the trailers.

In message , Nigel Pendse
writes

What is the motor-type noise that comes from under trains on the Met
line? It's obviously something that spins around but it doesn't seem
to be related to propelling the train?

I think it is the air compressors for the brakes and doors ( I have
read something about this before ).

All Underground trains have air compressers, but they are particularly
noisy on the elderly A stock. I can't remember if they're on all the
cars, or just the trailers.

Compressors are just fitted to trailers on LUL stock.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

Steve Fitzgerald wrote:

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

In message , John Rowland
writes
Steve Fitzgerald wrote:

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

Good point. I'm not familiar enough with 92 stock to remember that
(although that might be changing soon)
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

On Fri, 24 Nov 2006 13:28:21 +0000, Steve Fitzgerald ]
wrote:

In message , John Rowland
writes
Steve Fitzgerald wrote:

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

Good point. I'm not familiar enough with 92 stock to remember that
(although that might be changing soon)

You leaving the delights of the Piccklydickly line then?
--
Paul C


Admits to working for London Underground!

In message , Paul Corfield
writes

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

Good point. I'm not familiar enough with 92 stock to remember that
(although that might be changing soon)

You leaving the delights of the Piccklydickly line then?

I'm on the waiting list for Leytonstone, although it's currently only
surpassed by Upminster in it's length. 3 years against 2 years, so it
won't be any time soon.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

In article ,
(John Rowland) wrote:

Steve Fitzgerald wrote:

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

There are none. ISTR that the compressors are on the non-driving (cab or
shunting) cars.

--
Colin Rosenstiel

"Colin Rosenstiel" wrote in message
...
In article ,
(John Rowland) wrote:

Steve Fitzgerald wrote:

Compressors are just fitted to trailers on LUL stock.

Are there trailers on the Central Line?

There are none. ISTR that the compressors are on the non-driving (cab or
shunting) cars.

--
Colin Rosenstiel
Correct any 92*** car number has a compressor

On Thu, 23 Nov 2006 22:30:01 +0000, Steve Fitzgerald wrote:

What is the motor-type noise that comes from under trains on the Met
line? It's obviously something that spins around but it doesn't seem
to be related to propelling the train?

I think it is the air compressors for the brakes and doors ( I have
read something about this before ).

All Underground trains have air compressers, but they are particularly
noisy on the elderly A stock. I can't remember if they're on all the
cars, or just the trailers.

Compressors are just fitted to trailers on LUL stock.

Which, on the Met, are carriages 2, 3, 6, and 7.

asdf wrote:

Which, on the Met, are carriages 2, 3, 6, and 7.

They are the 6xxx series vehicles. Each 4-car unit is formed by two pairs of
cars, one motored driving vehicle (5xxx series) and one trailer vehicle,
with compressors (6xxx series). Not all of the driving motors are OPO
fitted, those that aren't can be easily identified as the front ends
continue the paint scheme carried on the sides of the vehicles, rather than
being painted red.