Abellio Greater Anglia Class 755s (Regional Trains)

[trebor79]

Provided there's a 25 kV or lower voltage electrical connection between power cars, then only one pantograph isn't a problem Class 755 have a power connection between power cars in order to distribute the power from the diesel generators. Many types of train have two pantographs, but equally many types have only one. Pendolinos, for example, have two pantographs but only use one at a time. Conversely, Desiro and Electrostar 4-car units only have one pantograph, and if run in multiple have to have all the pantographs raised.

Single pantograph units have been operated for decades very reliably. In the particular case of the class 755s, if the pantograph were to fail, they would still be able to get out of the way on diesel power!

Yes if you watch a 755 change over from diesel to electric you can watch the breakers close on the roof near the power unit (often with a spark and "crack" sound).
There's no high voltage connection between units working in multiple, AFAIK.

 

[100andthirty]

Yes if you watch a 755 change over from diesel to electric you can watch the breakers close on the roof near the power unit (often with a spark and "crack" sound).
There's no high voltage connection between units working in multiple, AFAIK.

I'm not surprised there's no 25kV connection on class 755 (unlike the Pendolinos) as there's the diesel-generator-voltage connection.

Misread previous post!

 

[trebor79]

I'm not surprised there's no 25kV connection on class 755 (unlike the Pendolinos) as there's the diesel-generator-voltage connection.

There is 25kV connections within the unit, but not between units working in multiple.

 

[ac6000cw]

There is 25kV connections within the unit, but not between units working in multiple.

Yes, and I *think* I remember reading that the electric traction equipment is fully modular, so the equipment for each power bogie is fed by its own transformer, rather than sharing a larger/heavier one - this would necessitate a 25kV bus line within the unit. I assume part of the reason for this is the articulated, low-floor design, which leaves limited space under the floor for equipment.

 

[Mike99]

With services from Ipswich to Cambridge, I've noticed that the 755's swop power modes at Stowmarket station. (I'm not saying that's every occasion just the ones I've seen)

 

[Shunter_69]

The only time that won’t happen heading to Cambridge/Peterborough is when the unit is already in Diesel mode. The will switch to Electric there on the way back

 

[RailWonderer]

Is there any plan to run 755s south of Ipswich in DOO or will it be guard only? Class 170s were able to run DOO south of Ipswich but needed a guard when in multiple. If not then 755s will probably only be used on IC workings.

 

[NoMorePacers]

Is there any plan to run 755s south of Ipswich in DOO or will it be guard only? Class 170s were able to run DOO south of Ipswich but needed a guard when in multiple. If not then 755s will probably only be used on IC workings.

Do they not already run DOO between Ipswich and Colchester (for the various Peterborough services that start/end at the latter)?

 

[Sleepy]

Is there any plan to run 755s south of Ipswich in DOO or will it be guard only? Class 170s were able to run DOO south of Ipswich but needed a guard when in multiple. If not then 755s will probably only be used on IC workings.

Currently they'll be worked by guards.

 

[Class 170101]

DOO south of Ipswich to Colchester on Peterborough services

 

[Sleepy]

I don’t know of any definite service plans but will certainly be a huge help if short of 745s now trains are so busy once again.

From 25th April until 13th May 1232 Norwich - Liverpool St. and 1500 return are booked to be 755/4 × 2 then as from 16th May this will be planned to be 1132 from Norwich and 1400 return from London.

 

[dk1]

From 25th April until 13th May 1232 Norwich - Liverpool St. and 1500 return are booked to be 755/4 × 2 then as from 16th May this will be planned to be 1132 from Norwich and 1400 return from London.

Two of my regular jobs so should pick them up at some point.

Just looked at drivers modified diagrams next week & they are still shown as 745s on both those workings.

 

[chubs]

How are they so short of 745's with reduced timetable on the StanEx? Are loads out of service, and if so what's the delay getting them working again?

I know it's better than nothing but even when coupled up 755's aren't ideal on the mainline.

 

[86246]

The 12:32 and 15:00 have just appeared on jouney check as formed of 8 coaches.

 

[dk1]

The 12:32 and 15:00 have just appeared on jouney check as formed of 8 coaches.

Units being prepped at the depot shortly.

 

[ashkeba]

Units being prepped at the depot shortly.

5P37 1205 Norwich C.Pt. T.&R.S.M.D to Norwich
1P37 1232 Norwich to London Liverpool Street
1P38 1500 London Liverpool Street to Norwich
5P38 1659 Norwich to Norwich C.Pt. T.&R.S.M.D

 

[mtmikethom]

5P37 1205 Norwich C.Pt. T.&R.S.M.D to Norwich
1P37 1232 Norwich to London Liverpool Street
1P38 1500 London Liverpool Street to Norwich
5P38 1659 Norwich to Norwich C.Pt. T.&R.S.M.D

402 & 419, 11 late at Ipswich

 

[dk1]

402 & 419, 11 late at Ipswich

Signalling issues around Norwich earlier.

 

[Sleepy]

402 & 419, 11 late at Ipswich

TCF at Norwich. 8 late at Stratford.

 

[dk1]

TCF at Norwich. 8 late at Stratford.

Further signalling issues at Stowmarket too.

 

[ashkeba]

What's TCF and are the signaling issues related to the train?

 

[dk1]

What's TCF and are the signaling issues related to the train?

Track circuit failure at Norwich & signalling issues caused further delay at Stow. Looks like it lost its path then too. One of those days.

 

[ashkeba]

Track circuit failure at Norwich & signalling issues caused further delay at Stow. Looks like it lost its path then too. One of those days.

thanks

 

[Railperf]

Just seen the pair - i did wonder if it would be a pair of 321s. Pleasant surprise to see the 755s. Both unit pans up btw. So assuming both on AC power.
Seems as though the 745/1s are less reliable than the 745/0s

 

[73128]

Usually fast to/from Ipswich but can change. Purely due to a 745 shortage of availability.

despite having 20 such sets????

 

[dk1]

despite having 20 such sets????

Yes.

 

[Jim-s]

Thanks all above for posting the info, It was a good sight to see passing thru marks tey on the 1232, not used to seing them at speed or on electric let alone a pair of them,
The “squawk” of the horn as described by my daughter is still an amusing sound to me

 

[Bikeman78]

Just seen the pair - i did wonder if it would be a pair of 321s. Pleasant surprise to see the 755s. Both unit pans up btw. So assuming both on AC power.
Seems as though the 745/1s are less reliable than the 745/0s

745103 is the worst offender. To be fair, the 745/1 spend far longer out in service between depot visits.

 

[170TurboFan]

745103 is the worst offender. To be fair, the 745/1 spend far longer out in service between depot visits.

745103 has been on the depot most times I have passed it

 

[Railperf]

An

745103 has been on the depot most times I have passed it

Any news on 755 pairings in service today?