Train Graphic
Great Western Passengers' Forum Great Western Coffee Shop - [home] and [about]
Read about the forum [here].
Register and contribute [here] - it's free.
article index - [here]
 07/09/2019 - Railfuture Severnside
08/09/2019 - CCIF initial bids deadline
14/09/2019 - Okehampton to Weymouth
21/09/2019 - RailFuture National, Bristol
25/09/2019 - WWRUG / Transport Focus
03/10/2019 - ACoRP Community Rail Awards
Random Image
Train Running @GWR Twitter Acronyms/Abbreviations Station Comparator Rail news GWR co. site Site Style 1 2 3 4 Chat on off
Next departures • Bristol Temple MeadsBath SpaChippenhamSwindonDidcot ParkwayReadingLondon PaddingtonMelksham
Exeter St DavidsTauntonWestburyTrowbridgeBristol ParkwayCardiff CentralOxfordCheltenham SpaBirmingham New Street
August 25, 2019, 04:48:23 pm *
Welcome, Guest. Please login or register.

Login with username, password and session length
Forgotten your username or password? - get a reminder
Most liked recent subjects
[123] Shortage of train crews on Great Western Railway since Septemb...
[60] Where was Red Squirrel 23/8/2019
[44] Looming driver shortage - heritage railways
[20] Meltdown - airline style!
[17] Bristol Temple Meads Station redevelopment
[10] Paralympian Sophie Christiansen stuck on SWR train - BBC News
News: A forum for passengers ... with input from rail professionals welcomed too
 
   Home   Help Search Calendar Login Register  
Pages: 1 2 [3]
  Print  
Author Topic: Qn.2 for Mark Hopwood: Decarbonising local railways  (Read 1375 times)
chuffed
Hero Member
*****
Posts: 1268


View Profile
« Reply #30 on: August 06, 2019, 03:03:16 pm »

Thank you Mark for providing that link. Much appreciated.
Logged
MarkHopwood
Full Member
***
Posts: 54


View Profile
« Reply #31 on: August 06, 2019, 04:58:38 pm »

The Severn Beach issues were also caused by crew, infrastructure and some other issues as well as fleet. Fundamentally the Turbo was the same train that had worked reliably in the Thames Valley.

The Class 230 has Ford Transit engines underneath that are failing in a terminal manner.

The scenarios are quite different.
Logged
IndustryInsider
Hero Member
*****
Posts: 7475


View Profile
« Reply #32 on: August 06, 2019, 05:20:51 pm »

I think the point is lots of things may be possible but they havenít happened yet and I am not keen to have my services used as a testbed - that should be done when customers wonít be put at risk of service disruption.

Let's hope the 769s don't prove to have reliability and performance issues if and when they come out of their very prolonged testing period.
Logged

To view my GWML Electrification cab video 'before and after' video comparison, as well as other videos of the new layout at Reading and 'before and after' comparisons of the Cotswold Line Redoubling scheme, see: http://www.dailymotion.com/user/IndustryInsider/
broadgage
Transport Scholar
Hero Member
******
Posts: 2718



View Profile
« Reply #33 on: August 06, 2019, 06:18:33 pm »

A battery powered train SHOULD be more reliable than a diesel powered one.
Batteries are inherently modular and means are readily available to automatically bypass a failed battery, allowing the train to proceed with almost unaltered performance.

Lithium iron phosphate batteries are the most likely technology, these are no longer new or exotic or untried technology, and are safer than lithium polymer batteries.

A 12 volt 100 AH lithium iron phosphate battery costs about £500 retail, less than half that much in bulk.
1,000 such batteries would cost in the region of £250,000 and would store over 1,000 Kwh of energy.
The total weight of these batteries is about 12 Kg each, or about 12 tons for 1,000 such.
That would power a 4 car train for a very considerable distance, silently and with zero pollution at the point of use.
Regenerative braking is easy with a battery train.
Charging could be fully automatic via a short length of conductor rail that for safety reasons is only rendered live when the train is over it.
Fast charging would be possible anywhere with an 11Kv mains supply available.
Slower charging anywhere with mains electricity.
Charging from existing OHLE is an alternative on routes that are partially electrified.
Logged

A proper intercity train has a minimum of 8 coaches, gangwayed throughout, with first at one end, and a full sized buffet car between first and standard.
It has space for cycles, surfboards,luggage etc.
A 5 car DMU is not a proper inter-city train. The 5+5 and 9 car DMUs are almost as bad.
eightonedee
Transport Scholar
Hero Member
******
Posts: 419


View Profile
« Reply #34 on: August 06, 2019, 10:31:27 pm »

One of the things you become used to on this forum are the foibles of its members. It seems the class 230 is to Mark what the catering on IETs is to Broadgage!

However the continuing delays in the class 769 programme are of concern, as this must be messing up the cascade of units. It would be good to have some openness about the problems that clearly are being experienced. From what I have gleaned it appears that the OHL/diesel bi-modes have problems to be resolved. Have any "tri-mode" versions been completed and are any yet being tested?

Logged
MarkHopwood
Full Member
***
Posts: 54


View Profile
« Reply #35 on: August 13, 2019, 06:44:48 pm »

I donít feel obsessed about 230s. I just donít understand the enthusiasm to bring super-annuated LUL trains to GWR which would make performance more challenging but I accept the 769s have to show decent performance!
« Last Edit: August 16, 2019, 03:56:14 am by MarkHopwood » Logged
Celestial
Sr. Member
****
Posts: 221


View Profile
« Reply #36 on: August 13, 2019, 06:55:39 pm »

I donít feel obsessed about 230s. I just donít understand the enthusiasm to bring super-animated LUL trains to GWR which would make performance more challenging but I accept the 769s have to show decent performance!

Given how long overdue the ones for TfW and Northern are, I think the first hurdle is that they show up at all.  Maybe you can beat the other two in getting yours in service first!  I see there have been some more failures of the 230 in the last few days, so whilst I was the one to suggest them, I do agree that the jury is still out on them, especially the diesel versions.
Logged
Do you have something you would like to add to this thread, or would you like to raise a new question at the Coffee Shop? Please [register] (it is free) if you have not done so before, or login (at the top of this page) if you already have an account - we would love to read what you have to say!

You can find out more about how this forum works [here] - that will link you to a copy of the forum agreement that you can read before you join, and tell you very much more about how we operate. We are an independent forum, provided and run by customers of Great Western Railway, for customers of Great Western Railway and we welcome railway professionals as members too, in either a personal or official capacity. Views expressed in posts are not necessarily the views of the operators of the forum.

As well as posting messages onto existing threads, and starting new subjects, members can communicate with each other through personal messages if they wish. And once members have made a certain number of posts, they will automatically be admitted to the "frequent posters club", where subjects not-for-public-domain are discussed; anything from the occasional rant to meetups we may be having ...

 
Pages: 1 2 [3]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.2 | SMF © 2006-2007, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
This forum is provided by a customer of Great Western Railway (formerly First Great Western), and the views expressed are those of the individual posters concerned. Visit www.gwr.com for the official Great Western Railway website. Please contact the administrators of this site if you feel that the content provided by one of our posters contravenes our posting rules (email link). Forum hosted by Well House Consultants

Jump to top of pageJump to Forum Home Page