So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

--
John Band
john at johnband dot org
www.johnband.org

John B wrote:
So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

Axle bearing faults apparently, but no more detail. I mentioned this in a
reply to your other ID earlier...

Paul S

On Jun 10, 2:17*pm, "Paul Scott"
wrote:
So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

Axle bearing faults apparently, but no more detail. I mentioned this in a
reply to your other ID earlier...

Aye, which is what prompted this post, to see if people who weren't
interested in the dregs of the strike thread knew anything about the
Electrostar problems. Should've acknowledged it was inspired by your
response tho', sorry.

--
John Band
john at johnband dot org
www.johnband.org

wrote in message
...
On Jun 10, 2:17 pm, "Paul Scott"
wrote:
So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

Axle bearing faults apparently, but no more detail. I mentioned this in a
reply to your other ID earlier...

Aye, which is what prompted this post, to see if people who weren't
interested in the dregs of the strike thread knew anything about the
Electrostar problems. Should've acknowledged it was inspired by your
response tho', sorry.

Seems bearings was a duff rumour anyway now...

Paul

On Jun 10, 3:54*pm, "Paul Scott"
wrote:

Axle bearing faults apparently,


Seems bearings was a duff rumour anyway now...

No ... axle bearings are the traction return earth path. Think about
it ... there is no other point of contact for the earth path.

Putting two and two together, the report of 130 mm bearings on 377/5
compared to all previous 377/x with 120 mm bearings causing something
to come into contact that should not could be an electrical earth
issue.

--
Nick

wrote in message
...
On Jun 10, 3:54 pm, "Paul Scott"
wrote:

Axle bearing faults apparently,


Seems bearings was a duff rumour anyway now...

No ... axle bearings are the traction return earth path. Think about
it ... there is no other point of contact for the earth path.

Ah I see. So where does brush gear come into it? I thought that would be
used to bypass the bearings to avoid heating effects. Might be thinking of
something else though...

Paul

On Jun 10, 1:57*pm, John B wrote:

So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

Found this by chance (another FCC webchat today it seems):

Q91
When do you expect to have the Class 377/5 units back in service and
why were they so unceremoniously withdrawn with such short notice?

A91
We stood down the 6 377/5 units last Friday due to a problem with the
earth return brushes which was found on unit 377 502 on routine
maintenance. We then examined 377 505 and found a similar problem. We
therefore stopped the fleet for examination and rectification. There
are 14 sets of return brushes on class 377/5 and not more than 30%
have been found defective on any unit. However we do not want these to
deteriate further and the situation to go unchecked so the
manufacturer, Bombardier, have been working on a solution. This
solution has started to be introduced today and we expect to have
trains back in service at the rate of two per day.

On Wed, 10 Jun 2009 05:57:03 -0700 (PDT)
John B wrote:


So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

I wasn't aware the 378s were in service yet.

B2003

wrote in message ...
On Wed, 10 Jun 2009 05:57:03 -0700 (PDT)
John B wrote:


So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

I wasn't aware the 378s were in service yet.


They aren't, but withdrawal for the same fault as the 377s would prevent
driver training and mileagae accumulation, further delaying introduction.

Paul S

On Wed, 10 Jun 2009 05:57:03 -0700 (PDT)
John B wrote:


So what's the latest (alleged) fault that's required the 377/5s and
378s to be taken out of service all about, then...?

I wasn't aware the 378s were in service yet.

B2003