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Scotrail Class 385 Discussion

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InOban

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Did someone omit to specify a surge protector? I thought that would have been a standard fitment.
 
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GreatAuk

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Does seem rather odd that a surge could work its way through all the fancy new electrics and end up frying a brake controller (I presume the power would have been through at least one ac/dc converter which shouldn't have passed on any overvoltage?). Seems like a rather obvious requirement that the train should be able to deal with voltage spikes unless this was massively out of tolerance for some reason?

Will be interesting to hear if any more details come out.
 
gordonjahn

gordonjahn

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GreatAuk said:
Does seem rather odd that a surge could work its way through all the fancy new electrics and end up frying a brake controller (I presume the power would have been through at least one ac/dc converter which shouldn't have passed on any overvoltage?). Seems like a rather obvious requirement that the train should be able to deal with voltage spikes unless this was massively out of tolerance for some reason?

Will be interesting to hear if any more details come out.
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Missing or defective freewheeling diode - or even a dodgy bit of solder - across an inductor in the power electronics/ conditioning equipment would probably be enough to do it - the (designed) act of removing the supply current before the neutral section would then cause the surge.
 
gordonjahn

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Just saw 385104 go through Lenzie at speed - looks like an Eastfield-Linlithgow run. Is it a positive sign of problems resolved if they’re allowed out on training/testing runs, during daylight, on the E&G?
 
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800001

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gordonjahn said:
Just saw 385104 go through Lenzie at speed - looks like an Eastfield-Linlithgow run. Is it a positive sign of problems resolved if they’re allowed out on training/testing runs, during daylight, on the E&G?
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I believe test running had not been stopped.
 
Highlandspring

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They were never not “allowed out on training/testing runs during daylight on the E&G”. They were withdrawn from passenger service, and remain so, but the fleet was not grounded.
 
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ptsc

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gordonjahn said:
Just saw 385104 go through Lenzie at speed - looks like an Eastfield-Linlithgow run. Is it a positive sign of problems resolved if they’re allowed out on training/testing runs, during daylight, on the E&G?
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I saw 385104 in the siding outside Linlithgow yesterday(Thursday) So I guess they are running it a few times
 
PYROOGOBBO

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hey will class 385's be doing any Edinburgh glasgow queen street via cumbernauld services or will they be done by 365's?, i know scotrail plan on putting them onto the edb dunblane services too
 
318266

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HellaEllie said:
hey will class 385's be doing any Edinburgh glasgow queen street via cumbernauld services or will they be done by 365's?, i know scotrail plan on putting them onto the edb dunblane services too
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Yes they will. According to ScotRail anyway.
ScotRail's website news page said:
  • New half hourly Edinburgh to Glasgow service (via Cumbernauld and Falkirk Grahamston) using brand new class 385 trains.
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PYROOGOBBO

PYROOGOBBO

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318266 said:
But it seems to me it will be quite unlikely that it will be 100% operated by 385's, some will probably have to be run by 365's.
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I imagine as Glasgow - Edinburgh via cumbernauld isnt as high priority as Glasgow - Edinburgh via falkirk high, it may be 365's that are shoved out by new 385's maybe with a 385 or two
 
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Carntyne

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Back out this morning. The via Cumbernauld service will be Class 385 operated, not Class 365.
 
385001

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Article now on BBC website.

https://www.bbc.co.uk/news/uk-scotland-45849119

BBC said:
First new ScotRail train back on track after fault fixed
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SNS Group Ross Brownlee/ PA Wire
Three class 385 trains were pulled from service after a brake control system fault was discovered earlier this month
The first of several new trains taken out of service over a technical fault is back in operation after the problem was resolved, ScotRail has announced.

It was one of three Hitachi class 385 electric trains taken off commuter routes after a brake control system issue was detected earlier this month.

The seven-carriage train began operating again between Edinburgh and Glasgow via Falkirk High on Saturday.

The remaining two trains are expected to return to service next week.

The fault, which "led to a small loss of signalling across the brake network cables" was identified on 4 October.

'Modification applied'
ScotRail said the train had remained safe as the overarching brake control was not affected, adding that the driver was in control of it at all times.

The operator has now applied "a modification" to fix the fault, which it will apply to all of the class 385 trains.

ScotRail Alliance managing director Alex Hynes said: "I am pleased that Hitachi has resolved the issue with the class 385 train, and that we can get it back into service for our customers.

"There can sometimes be difficulties when introducing a brand-new fleet, but it's great that customers will once again be able to benefit from these modern electric trains."

In July, ScotRail said there were due to be 70 of the new class 385 electric trains running in the central belt by early next year.
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Train4life

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Train4life said:
"led to a small loss of signalling across the brake network cables" not according to the NIR!!! It seems it was a complete loss of braking communication and Emergency had to be used.
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Also seems not just the one occasion this has happened... Let’s hope they have got the root cause.
 
AlexNL

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Train4life said:
"led to a small loss of signalling across the brake network cables" not according to the NIR!!!
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Welcome to the world of public relations management, where bad news has to be massaged so that it doesn't look that bad.

It's good to hear that the issue has been found, and a fix could be applied rather quickly.
 
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joig

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Okay I do not understand this statement "led to a small loss of signalling across the brake network cables". If they had a loss in in the brake network cable no matter how transient this surely would mean that the brake system would fail safe without any need to depend back up brake system. What I am saying is that any temporary loss of brake network communication at any time all brakes should apply by default. As i understand networks are are polling all the time and if you get at a no response or error everything stops safely the answer is " i have lost communication apply maximum braking now"
 
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