-
Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Abellio Greater Anglia Class 755s (Regional Trains)
- Thread starter swt class 450
- Start date
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R
RailUK Forums
Abbo
Member
Some might consider this thread gone off in the realms of fantasty or maybe not. The coast road in North Norfolk goes past the high security radar + base at Trimmingham ( was M&GN/n&s jT ) and some while agho some cars of French manufacture were grinding to a halt as they passed the installation. 'Nothing to do with us guv ) was the initial and repeated response from the MoD until the number of complaints grew................and then the problem ceased. Were the frequencies at Trimingham altered ....................no public comment.
supervc-10
Member
- Joined
- 4 Mar 2012
- Messages
- 702
I know of at least one hire car that was destroyed by a military radar installation under test back when cars were first getting electronic fuel injection.
I will point out that when I mean high power, I mean HIGH power, the highest powered transmitters were Marconi 500kW units with the lower power ones being ~300kW units I believe, and there were multiples of each. Now I'm talking about the rated power of the transmitters themselves here not the ERP once it comes out of the antenna which unless the aerials are very inefficient, which I doubt, will be much greater than the rated transmitter output power.
Rhinojerry
Member
Think they are visiting,for Exercises or passing through.Definitely not based there.
This makes no sense. How can extra power magically appear between transmitter and antenna?
Unless you've discovered a free source of energy and thus will be the saviour of the climate.
And I highly doubt any aircraft radar is causing issues with trains (but no cars, mobile phone miles or other equipment) several miles away.
F Great Eastern
Established Member
Can someone explain this
21:20 Cambridge to Norwich due 22:37
Facilities on the 21:20 Cambridge to Norwich due 22:37.
Will be formed of 8 coaches instead of 12.
21:20 Cambridge to Norwich due 22:37
Facilities on the 21:20 Cambridge to Norwich due 22:37.
Will be formed of 8 coaches instead of 12.
Weren't the class 92s getting knocked out by a nearby factory's electrical interference around Warrington though?
daveshah
Member
- Joined
- 1 Sep 2018
- Messages
- 115
ERP (effective radiated power) is the power equivalent to an antenna that radiates equally in all directions, so a directional antenna can have an ERP higher than transmitter power - because in the strongest direction the power density is higher, at the expense of weaker power in other directions.
Railperf
Established Member
- Joined
- 30 Oct 2017
- Messages
- 2,941
Depends what the software update actually includes.
Let's remember the 755/4s were tested first extensively in and around Norwich. The 755/3's have come in much later and effectively been 'rushed' into service. A correspondent of mine reports that on much easier schedules with longer dwell times, there are hardly any issues with the 755/3 - even on the Bury route!
IF the cooling is inadequate - no software update is likely to fix that. But i guess Stadler could program the engines to go into a derate mode if temperatures start to reach higher than desired levels. Either way - they appear to be overheating, or the traction system computer is throwing a wobbly because of the way it is programmed to deal with a temperature spike.
ashkeba
Established Member
- Joined
- 13 May 2019
- Messages
- 2,171
Either some 755/4s are running in multiple or the random number generator has got into the boards.
Yes, that's why the Crystal Palace transmitter, for example, could radiate 1MW on analogue without requiring 1MW or transmitter power.
It's the same with reception, naturally, where an omnidirectional antenna will have 0 DB of gain, or in some cases negative gain (halo FM antennas being an example) and a directional aerial will have positive gain.
The BBC R+D new site reports are good sources of what ERP can be gained from what combination of transmitter power and aerial.
Yes, but you're confusing ERP with actual power. If you have a 1MW transmitter you can't get more than 1MW power from the aerial.
What you can get, if you focus the aerial, and put a receiver in the right location is a signal that appears to be emanating from a higher powered transmitter. From an unfocused transmitter, the energy radiates and dissipates as the inverse square of distance. With a focused transmission, if you apply that inverse square law you will arrive at an ERP that is higher than the actual transmission power.
You haven't magically made power (energy) out of nothing. You've just applied a mathematical model that is used to measure apparent transmitter power.
Anyway, this is a bit OT now, but I still remain absolutely unconvinced that the 755s are being affected by anything at Mildenhall or in the skies above.
ivzem
Member
https://www.realtimetrains.co.uk/train/86991/2020-02-05/detailed Is this it? Empty move Crown Point - Ipswich - Ely - Ipswich - Crown Point. Pathed as electric locomotive with 755 tonnes trailing load, heh.
PG
Established Member
Icky Qualms
Member
Sitting on 3 car Ipswich to Peterborough at the moment just failed at Chippenham junction
170TurboFan
Member
- Joined
- 25 Jul 2018
- Messages
- 301
Has just moved 22 late https://www.realtimetrains.co.uk/train/L47211/2020-02-05/detailed probably a reboot was done. Funnily enough if it had been stopped any longer it would have delayed the train with the suspected software update on test to resolve this issue. https://www.realtimetrains.co.uk/train/86991/2020-02-05/detailed.
Icky Qualms
Member
Yes got it going again just stopped outside Ely with a signal check
Railperf
Established Member
- Joined
- 30 Oct 2017
- Messages
- 2,941
Yes they do not seem to like prolonged periods of power. That service is limited stops..so more time in power and less time to cool down. A pattern is emerging. So is the hardware at fault cooling issues, radiator air flow blockages etc) or is it a software glitch? The long reboot time gives the engines a chance to cool down if they are overheating.
Maltazer
Member
- Joined
- 7 Feb 2019
- Messages
- 71
Apart from the failure reported yesterday afternoon, there was also another Ipswich-Peterborough delayed around 25mins near Kennett yesterday lunchtime. It was explained as signalling issues, but since we know how true that usually is, I wonder if that was yet another similar failure.
Seems very odd that it keeps happening in that area (and no I don't believe the USAF has anything to do with it!)
Mal
delticdave
Member
- Joined
- 14 Apr 2017
- Messages
- 449
But, are there 2 compartments,each with 1 engine + empty space, (most logical IMVHO), or... 2 normal-sized engine compartments as per the 755/4's + 2 sealed off empty spaces, possibly filled with extra fuel tanks? 'Tis a mystery.....
Carlgoss
Member
I think the GA graphical timeline of new train introduction on their website has been creatively tweaked and altered considerably over the time since it was first introduced.
I notice the timeline going forward now doesn't, so no more mention of new timetables etc. One of the latest alterations is marked right at the end of 2019 (a couple of months ago) and titled 'Winter - First trains arrive in East Anglia for testing' . Now I'm not saying anything.. but.. Pinocchio's long nose comes to mind.
I notice the timeline going forward now doesn't, so no more mention of new timetables etc. One of the latest alterations is marked right at the end of 2019 (a couple of months ago) and titled 'Winter - First trains arrive in East Anglia for testing' . Now I'm not saying anything.. but.. Pinocchio's long nose comes to mind.
Last edited:
F Great Eastern
Established Member
Was said to be late due to signalling issues at one point. Seen another one described as due to late freight train after sitting down as well..
F Great Eastern
Established Member
Services on rural lines operating out of Ipswich are being disrupted due to a problem with track circuits caused by a fault with the signalling system according to Greater Anglia.
This is disrupting services between Ipswich and Cambridge as well as services between Ipswich and Lowestoft according to Greater Anglia leading to cancellations, delays and trains not running their full route.
This is disrupting services between Ipswich and Cambridge as well as services between Ipswich and Lowestoft according to Greater Anglia leading to cancellations, delays and trains not running their full route.
Alan Warren
Member
- Joined
- 22 Mar 2019
- Messages
- 31
dk1
Veteran Member
He loves being in the limelight doesn't he?
samuelmorris
Established Member
Well, not exactly unexpected. If 2-car trains are overcrowded, 4-car trains running half as often will be similarly crowded
WroxhamTroll
Member
Inconvenience in a convenience?
To be fair, GA do have a habit of turning late running services at Ely.
I understand the logic - it get train and crew back onto the diagram and there are usually plenty of other options to get between the 2 stations. But perhaps in cases like this where it's obvious there will be a problem with overcrowding, it might be more sensible to continue the journey?
Maybe get it back onto diagram later in the day by turning early somewhere else like Bury? At least that was some of the passengers can get on the later running train rather than everyone try to cram onto what is likely to be the busiest departure of the day.
I understand the logic - it get train and crew back onto the diagram and there are usually plenty of other options to get between the 2 stations. But perhaps in cases like this where it's obvious there will be a problem with overcrowding, it might be more sensible to continue the journey?
Maybe get it back onto diagram later in the day by turning early somewhere else like Bury? At least that was some of the passengers can get on the later running train rather than everyone try to cram onto what is likely to be the busiest departure of the day.
306024
Established Member
In other news the 07.50 Harwich International to Cambridge ran throughout today (first time in ages?). Issues operating 755s in passenger service on the Harwich branch and round Manningtree North curve seemingly now resolved.
Class 755 availability shouldn't be an issue at the moment with the Wherry line blockade, but hopefully once services return to the booked timetable, the numerous rural line cancellations will be a thing of the past.
Class 755 availability shouldn't be an issue at the moment with the Wherry line blockade, but hopefully once services return to the booked timetable, the numerous rural line cancellations will be a thing of the past.