theironroad
Established Member
9P34 experienced another Change Of Aspect... wonder if we can get a hat trick
Guess we'll find out sometime around 1642-1645 today if it's running RT.
9P34 experienced another Change Of Aspect... wonder if we can get a hat trick
Is it currently thought this change of aspect (COA) problem can be caused by any of the 442s, or could it be a few particularly “noisy” traction systems? Presumably someone is recording which specific units are involved?I wonder how much longer this will continue before SWR and NR are forced to get their head out of the sand admit their is a problem and fix it?
There are signalling interference test trips in the system for the next few nights. ECS Bournemouth to Clapham and then several round trips between Claphan and Surbiton.
Is it currently thought this change of aspect (COA) problem can be caused by any of the 442s, or could it be a few particularly “noisy” traction systems? Presumably someone is recording which specific units are involved?
Some of the travelling fitters I've had accompany me on a number of journeys theorised it may be a dodgy converter (takes the traction current and makes it suitable for 'hotel power') but its been a number of different units now so my money is on a fault with the signal itself (it's always the same one) which for some reason is more sensitive to the 442s.
Looks like 9P52 has had a COA at Earlsfield. That's a hat trick today, who gets to keep the match ball?!
I reckon Pompeyfan should have it since it was his prediction.
You’re too kind! It’s a bit silly though that these issues can be predicted.
The auxiliary (hotel) converters are a known issue, originally they weren't down to be replaced as part of the re-tractioning but now are (hence the delay while they procured some) as the existing ones cause major EMC issues.
Rolling stock manufactures in general are discovering that low quality auxiliary converters are a reliability problem on much newer stock (they had regarded it as money saving area!)
Original as built as I understand it.Presumably this is equipment that has been fitted since the original tenure of the 442s on the south-western up to 2006 (ish)? I know that inverter technology has developed a lot in recent decades, but what would they have been built with, earlier and simpler inverters, DC motor / AC generator sets, or was everything just DC-powered on board?
I'm hoping I can get to ride on one before they're re-tractioned, the sound of EE motors again would make a change from the warbling of the Desiros.
Ah, OK, thanks. I don't remember this having been an issue in their earlier days, so has the signalling become more susceptible to interference? Or did similar issues occur in the 1990s but there were no internet forums to tell us about itOriginal as built as I understand it.
Data recording is far better now.Ah, OK, thanks. I don't remember this having been an issue in their earlier days, so has the signalling become more susceptible to interference? Or did similar issues occur in the 1990s but there were no internet forums to tell us about it
Does anyone know how many units are available for service now? I've had 7 so far (406, 408, 410, 413, 414, 417 and 420).
Understood, thanks for the explanations. I was an intermittent user of the Direct in the 1990s, but always the stoppers, so my memories are of the slammers rather than the 442s.Data recording is far better now.
12.5 years since they last ran on SW turf.
Internet has changed... (Some of the GatEx / SN era issues have been covered on the forum I'm sure)
Electrical power use in general is far higher e.g. 10car on the slows and desiros on the fasts and more 12car 450s than there used to be post 707 introduction - the power environment has changed.
I've got the 4REP/ '67 Bournemouth electrification problems report somewhere...
Does anyone know how many units are available for service now? I've had 7 so far (406, 408, 410, 413, 414, 417 and 420).
Ridden on with SWR.Where you say had, do you mean passed on, driven, or spotted?
I have an HNC in Electrical Engineering from 25 years ago, so some of the discussion on COA makes sense. I wondered if it makes a difference whether the train is drawing current (ie being driven) versus coasting over the troublesome section in question This is why I got out of engineering as soon as I could and moved into Human-System Interfaces
i see 9P52 dropped 3 mins between wimbledon and clapham today, is that long enough to be a COA? Maybe someone else can confirm.
Running 3l from Woking so had 1A52 routed ahead at Surbiton, which has a stop at Clapham as well, causing the delay to 9P52i see 9P52 dropped 3 mins between wimbledon and clapham today, is that long enough to be a COA? Maybe someone else can confirm.
Ah ok, thanks for the info.Running 3l from Woking so had 1A52 routed ahead at Surbiton, which has a stop at Clapham as well, causing the delay to 9P52
9P16 sat just south of Godalming for quite a while this morning. Expect about 12 late at Guildford. Not sure if the issue is the train or infrastructure.
2x signals one held at danger, one blank...Reported as a signaling fault.