Rail Users Ireland Forum

Go Back   Rail Users Ireland Forum > Irish Rail Customer Service Issues > Commuter Services > DART
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Unread 24-02-2018, 20:23   #1
JD9948
New to the board
 
Join Date: Sep 2017
Location: Greystones
Posts: 3
Default Irish Rail Bi-Mode Trains

Hi Folks,

I was reading one of the leading rail magazines(Rail Express). In it’s most recent edition, in the “Irish Angle” section it stated that;

“Irish Rail and National Transport Authority(NTA) are considering the possibility of acquiring a fleet of bi-mode trains for service in the Greater Dublin Area. It is understood that the Diesel/Electric Units would be used to extend the existing DART services beyond the present electrified area to Drogheda and Maynooth. Around 100 vehicles have been mooted, and IR hopes to have the units in service within four years”.

I take great interest in Irish Railways but am definitley no expert. Do you guys think this will ever happen and what’s your opinion on this? Thanks a million.

JD9948
JD9948 is offline   Reply With Quote
Unread 25-02-2018, 17:52   #2
Mark Gleeson
Technical Officer
 
Mark Gleeson's Avatar
 
Join Date: Dec 2005
Location: Coach C, Seat 33
Posts: 12,638
Default

No tender has been issued as such anything is speculation

In short its a bad idea
Mark Gleeson is offline   Reply With Quote
Unread 25-02-2018, 21:41   #3
James Shields
Member
 
James Shields's Avatar
 
Join Date: Dec 2005
Location: Drogheda, Ireland
Posts: 1,258
Default

Quote:
Originally Posted by Mark Gleeson View Post
No tender has been issued as such anything is speculation

In short its a bad idea
The speculation or the concept is a bad idea?

I know in the UK and other countries DEMUs are quite common, with a Diesel generator powering electric motors. It doesn't seem a huge stretch to have a Diesel generator and a pantograph the can pick up power from overhead lines where present, and a Diesel generator as backup where they aren't.

However, I expect every changeover will take a couple of minutes, so it seems pointless unless you have a substantial section of electrified track to run on.
James Shields is offline   Reply With Quote
Unread 26-02-2018, 11:21   #4
comcor
Really Regular Poster
 
Join Date: Dec 2005
Location: Cork-Dublin, Cork Commuter and occasionally DART and Dublin-Wexford
Posts: 840
Default

The main use would seem to be if we are to have a very slow electrification program.

There's no point buying electrical until the power lines are in place.

There's no point having diesel after the lines are in place.

Normally, you would say to buy diesels and cascade them to areas where there is no electrification. That's not so easy, with the Cork Commuter service being the only significant operation outside Dublin suitable for Dublin's retired diesels. Even if massively expanded to double frequency and train capacity on current services it could take at most 15% of diesel railcars.

So in the absence of a big bang approach to electrification on the Dublin commuter network, hybrids become necessary.
comcor is offline   Reply With Quote
Unread 26-02-2018, 12:50   #5
James Shields
Member
 
James Shields's Avatar
 
Join Date: Dec 2005
Location: Drogheda, Ireland
Posts: 1,258
Default

Thanks for the info. I see they are in use in a number of other countries.

Does anyone have experience of travelling on a bi-mode train? I'd be interested to hear how smooth the change-over process is.
James Shields is offline   Reply With Quote
Unread 26-02-2018, 15:38   #6
Jamie2k9
Really Really Regluar Poster
 
Join Date: Jun 2010
Posts: 2,133
Default

Quote:
Originally Posted by James Shields View Post
Thanks for the info. I see they are in use in a number of other countries.

Does anyone have experience of travelling on a bi-mode train? I'd be interested to hear how smooth the change-over process is.
I traveled on the Great Western new express trains and the switch over was seamless. As soon as engines switch off the pantograph rises and train able to depart seconds lather. It was a calling point where the switch over happend but goes without saying it doesn't need to stop to facilitate the changeover.

Not experienced overhead to diesel yet.
Jamie2k9 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT. The time now is 10:21.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.