Milo T.K
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- 10 Mar 2018
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Diesel on a 755 is fine unlike e.g a 37 which made some of my colleagues I'll from the fumes unlike the 755 in which there was no stink and barely anyone noticed it
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Abellio Greater Anglia Class 755s (Regional Trains)
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Does anyone know why the air conditioning/ventilation gets noticeably noisier when these units are at a stand? It's particularly noticeable when stopped somewhere other than a station (I guess because at stations there's a hustle and bustle drowning it out).
It's possible that it's not the HVAC system getting louder, but the cooling systems for the traction motors and electronics.
When the train is moving, there is natural air flow through the system so less forced ventillation is needed. This is not true when the train is standing still.
When the train is moving, there is natural air flow through the system so less forced ventillation is needed. This is not true when the train is standing still.
dk1
Veteran Member
Think that was due to 745 on the 06:39 Ipswich-Norwich failing before departure with pantograph issues.
Sleepy
Established Member
Think it was the 0530 1P03 which had pan issues, stock was taken from 0639 to work to London. Failure dragged back to Norwich by 755.
dk1
Veteran Member
Only saw about the 06:39 so didn’t pay much attention after that.
755s failed before departure today (Thursday) & booked 745 had gone to the depot resulting in 12:32/15:00 being cancelled.
No 755s out on P37/38 today (Friday) either.
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Shunter_69
Member
- Joined
- 10 Dec 2014
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- 478
Out of curiosity, when a 755 is on diesel it shuts down and locks the doors after 20 mins without a key in. How does it work when in multiple and one unit is on electric and the other is on diesel?
In multiple if both units are shut down the same rules applies, although it's 30 minutes before they shut down now, they got updated. Not sure about half and half though as they don't share supply, only TCMS function.
Shunter_69
Member
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- 10 Dec 2014
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- 478
Glad they’ve updated that, I’ve seen it a few times when it was 20 mins and people have been locked in the train.
ac6000cw
Established Member
755s have rheostatic braking with the resistor grids on the roof - if these are fan cooled that might also account for extra fan noise after braking to a stop.
I would assume that when the 755s are running on ac, the kinetic energy would be dissipated by regen back into the OLE.
ac6000cw
Established Member
AFAIK, based on what's been posted on the forum, yes the 755s have rheostatic & regen, 745s regen only.
They still get locked on the train even with 30 minutes! Dangerous really.
dk1
Veteran Member
I try to leave a key in if in platform 6 at Norwich or if pans are isolated.
If it’s going to be a long while (& it’s not my last bit) then I will lock it up.
I would assume that (although some EMUs have rhestatic loads for when the OLE doesn't take a return current). Anyway, my point is that a 755 under wires would normally use regen, so there would be no resistance cooling required when the train brakes are applied.
Came up to Norwich for a ride or two on a 755 today, - sat waiting on the 12:36 to Yarmouth then it was cancelled because of broken rail - Lowestoft services out as well, so no chance to do the East Suffolk line. On 13:00 back.to Ipswich to try the Felixstowe beach, not much of a test there. 745s OK, but a bit clunky at the Jacobs bogie ends.
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ac6000cw
Established Member
It was on diesel. I'm fairly sure the noise was coming from the HVAC vents, but I'll have a harder listen next time!
Bringback309s
Member
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- 22 Aug 2013
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- 314
Apparently, a 755 is doing training runs to Clacton this week - is this for Clacton drivers and future 745's?
dk1
Veteran Member
No mate, its just for testing purposes.
gingerheid
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- 2 Apr 2006
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Very random question time 
Is there anywhere in the UK that would be able to do heavy repairs to a damaged 755, or would it have to go to Switzerland?
The reason I ask is that one of Estonia's Flirts was damaged in a level crossing incident (pictures giving an idea of the extent of the damage at https://tartu.postimees.ee/7474884/...-reisirongile-ette-kummekond-inimest-sai-viga, loading onto trailer at JDEFUHMmbWA ). Of course with a fleet of a similar size to Greater Anglia's it's been sent to Switzerland on a low loader as they don't have the facility to do such a repair. I'm imagining we also lack such facilities, and that it would further be quite difficult for us to send a unit on such a journey?
Is there anywhere in the UK that would be able to do heavy repairs to a damaged 755, or would it have to go to Switzerland?
The reason I ask is that one of Estonia's Flirts was damaged in a level crossing incident (pictures giving an idea of the extent of the damage at https://tartu.postimees.ee/7474884/...-reisirongile-ette-kummekond-inimest-sai-viga, loading onto trailer at JDEFUHMmbWA ). Of course with a fleet of a similar size to Greater Anglia's it's been sent to Switzerland on a low loader as they don't have the facility to do such a repair. I'm imagining we also lack such facilities, and that it would further be quite difficult for us to send a unit on such a journey?
I reckon any heavily damaged 755 would just be dumped into the Wensum sidings at Crown Point and salvaged for parts!Very random question time
Is there anywhere in the UK that would be able to do heavy repairs to a damaged 755, or would it have to go to Switzerland?
The reason I ask is that one of Estonia's Flirts was damaged in a level crossing incident (pictures giving an idea of the extent of the damage at https://tartu.postimees.ee/7474884/...-reisirongile-ette-kummekond-inimest-sai-viga, loading onto trailer at JDEFUHMmbWA ). Of course with a fleet of a similar size to Greater Anglia's it's been sent to Switzerland on a low loader as they don't have the facility to do such a repair. I'm imagining we also lack such facilities, and that it would further be quite difficult for us to send a unit on such a journey?
AlexNL
Established Member
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- 19 Dec 2014
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- 1,683
Arlington Fleet Services at Eastleigh, maybe?
Brodies is another option, the straightened out the damage to 170204 a few years ago.
That being said the 350s involved in the Watford Tunnel crash were both sent back to Siemens in Germany for repair. It may be down to insurers, owners, operators and builders to decide who has to fix the damage.
That being said the 350s involved in the Watford Tunnel crash were both sent back to Siemens in Germany for repair. It may be down to insurers, owners, operators and builders to decide who has to fix the damage.
If the manufacturers aren't offering a repair option on the contract, then it goes to whoever has the lowest quote for the work.
dk1
Veteran Member
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dk1
Veteran Member
Most welcome. It’s only a select few units in each fleet.Ah thought it would be something along those lines, thanks
Sleepy
Established Member
Lol thought it read dumped into River Wensum to start with !