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Metro

if it's about Cardiff.. Sport, Entertainment, Transportation, Business, Development Projects, Leisure, Eating, Drinking, Nightlife, Shopping, Train Spotting! etc.. then we want it here!
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Msmurf

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Re: Metro

PostSat Jun 23, 2018 4:19 pm

North City Boy.... not questioning your eyesight - but that of Network Rail. The border line is not due for electrification so it must be to allow for line to be cleared
Build it and they will come.
Get it wrong and they will fall off.
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MrJamesBrown

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Re: Metro

PostTue Jun 26, 2018 12:23 am

NorthCityBoy wrote:
Ash wrote:I think Msmurf was joking that they might have electrified a section of the line to Cwmbran by mistake!

In fact, I've noticed in quite a few places along the GWR mainline that they've electrified short sections of other lines around junctions.

I've no idea why they do this. Maybe its something to do with being able to move trains off the main line or to make future electrification easier. IIRC there was some talk about electifying the borderlands line as far as Abergavenny.


Ah right. Sorry smurf. Yes I did wonder if it were to allow trains to move off the mainline, but they are bi mode trains so presumably that would be unnnecssay, which made me think, are they making a start on other lines?


It's so if a train is incorrectly signalled down a line that is not electrified, the train can reverse without getting stranded.
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Msmurf

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Re: Metro

PostTue Jun 26, 2018 12:33 am

But why is this neccesary for bi-mode trains...? It is no wonder that the cost overruns were so large!
Build it and they will come.
Get it wrong and they will fall off.
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Baysailor

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Re: Metro

PostTue Jun 26, 2018 9:39 am

The bi-mode switchover doesn’t instantaneously happen. The diesel engine is shut down and the electric motor started (or the other way around). As you wouldn’t want to stop and do this on the mainline, maybe it makes sense to electrify a stretch off it to allow the train to convert power source.
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NorthCityBoy

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Re: Metro

PostSun Jul 22, 2018 10:15 pm

I wonder if anyone can shed some light. I’ve noticed recently that, as a consequence of the engineering works on the mainline, that there have been replacement buses on the Cardiff - Ebbw Vale line which has been shut for several weeks.
The question is, have they taken this valuable opportunity to complete the extending of the passing loop on this line which was supposed to have been completed, I think, around a year or two ago?
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dazplott

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Re: Metro

PostTue Jul 24, 2018 2:01 pm

Baysailor wrote:The bi-mode switchover doesn’t instantaneously happen. The diesel engine is shut down and the electric motor started (or the other way around). As you wouldn’t want to stop and do this on the mainline, maybe it makes sense to electrify a stretch off it to allow the train to convert power source.


I thought these bi-mode trains were primarily electric - that is to say that they have electric traction motors on the axels. Power for these motors can come either from the overhead lines or from Diesel engines (generators) located in some of the carriages. If this is the case then you would think the switchover could be fairly instantaneous - there may be some momentarily loss of power (which could be mitigated by small batteries), but it doesn’t seem like something that could only be done while the train is stationary.
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halfnhalf

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Re: Metro

PostThu Jul 26, 2018 11:25 pm

they only change power while stopped according to me mate who knows
they have really are going slow getting the lines to cardiff
i could do it meself quicker
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MrJamesBrown

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Re: Metro

PostFri Jul 27, 2018 1:27 pm

Msmurf wrote:But why is this neccesary for bi-mode trains...? It is no wonder that the cost overruns were so large!

It is a common part of Electrification. Remember not all trains are Bi-mode. Additionally if reduces complexity when other lines are extended as the main line does not need to be closed for the electrification 'join' to be completed.

halfnhalf wrote:they only change power while stopped according to me mate who knows
they have really are going slow getting the lines to cardiff
i could do it meself quicker


IIRC there are some parts on the line to London where trains can change whilst moving, However the section needs to be reinforced to avoid the wires coming down. Also the change has to be be planned especially if going from Electric to Diesel for the engines to 'warm up.'
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Lyndon

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Re: Metro

PostTue Aug 14, 2018 12:17 pm

It's really happening:

UK: Stadler Rail has been confirmed as preferred bidder to supply a total of 71 trainsets for use on the next Wales & Borders franchise from 2022.

The Swiss company is to supply 36 three-car Citylink tram-train vehicles for use on South Wales Metro services from Cardiff to Treherbert, Aberdare and Merthyr Tydfil. These would be able to operate under the planned 25 kV 50 Hz electrification as well as on battery power. This will permit the use of discontinuous electrification, avoiding the complexity, disruption and expense of installing overhead equipment in challenging locations such as tunnels and bridges with restricted clearances. Battery power would also be used on a proposed street-running extension of the Cardiff Bay branch line to Flourish and potentially other proposed extensions in the Cardiff area.

Stadler will also supply 35 Flirt multiple-units. Of these, 11 will be diesel multiple-units for use on services to Maesteg, Ebbw Vale and Cheltenham. There will also be seven three-car and 17 four-car tri-mode units capable of running on diesel, 25 kV 50 Hz overhead electric and battery power. These are scheduled to enter service on cross-Cardiff routes from 2023, using diesel power on the Vale of Glamorgan, Barry and Penarth routes south of the city and electric power to Rhymney and Coryton lines to the north. The use of battery power will avoid the need for costly modifications to 55 bridges along the routes, particularly north of Caerphilly.


https://www.railwaygazette.com/news/passenger/single-view/view/wales-borders-electric-train-order-confirmed.html
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Lewisbeecham

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Re: Metro

PostTue Aug 14, 2018 12:52 pm

It's such a game changing project. It's going way too smoothly...
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