Electrification

Grandeeod · 04-10-2015 03:53PM

metrovick001 wrote: »

The electrification of Bray-Greystones was an absurd waste of tax payer money. Just an election stunt (the late Johnny Fox)
The cost of the OHLE & putting it up (not to mention replacing / maintaining it) would probably have paid for a dedicated two-piece railcar (several times over) which is all the town needed link it into the existing DART system.
As it stands, the frequency of the service is thirty minutes for a nine minute run - ideal for a shuttle with a cross platform change.

Ahh well, I look forward to te extension to Wicklow :-)

At last. Some more common sense.

WomanSkirtFan8 · 05-10-2015 01:09PM

Victor wrote: »

While having a rail link to Greystones is necessary, it isn't without its problem, in particular the cost of maintaining the over lines through Bray Head.

Malahide provided its own problem, as there is frequent messing about with wrong-line running and/or trains operating on the 'wrong' platform.

Yes that's absolutely right. Another problem in getting the DART to both Malahide and Greystones back in 2000 was verarious union disputes at the time.

Getting the Overhead Electrical Wires for the DART through the tunnels on Bray head to greystones was the biggest challenge that IE faced at the time. The railway line had to be lowered slightly in order for this to be done at the time.

nokia69 · 05-10-2015 06:17PM

battery powered trains might be a good idea in some places

MGWR · 06-10-2015 06:06AM

nokia69 wrote: »

battery powered trains might be a good idea in some places

Been there and done that in Ireland.

metrovick001 · 08-10-2015 11:25AM

What should we burn to generate steam to drive the turbine that turns the generator to produce a charge that supplies the transformer that charges the batteries that power the traction motors that move the train??

Markcheese · 11-10-2015 09:05AM

metrovick001 wrote: »

What should we burn to generate steam to drive the turbine that turns the generator to produce a charge that supplies the transformer that charges the batteries that power the traction motors that move the train??

Diesel probably - if it's an on board generator that shuts off for certain sections- kind of like a Prius -

Cookie_Monster · 12-10-2015 09:34AM

metrovick001 wrote: »

What should we burn to generate steam to drive the turbine that turns the generator to produce a charge that supplies the transformer that charges the batteries that power the traction motors that move the train??

in reality; turf or coal or gas.

but could be generated from hydro or PV or wind or even tidal if they ever get around to serious implementation.

Carawaystick · 12-10-2015 02:40PM

Cookie_Monster wrote: »

tidal if they ever get around to serious implementation.

Ah yeah, let the moon dictate when your train can run...

Cookie_Monster · 15-10-2015 12:21AM

Carawaystick wrote: »

Ah yeah, let the moon dictate when your train can run...

don't be an idiot. The fact is tidal is reliable and very fixed in terms of knowing and planning outputs, especially compared to wind. to solve your imagined timing problem you could alway use it to power pumped storage or batteries to release the energy when required rather than when produced.

Victor · 16-10-2015 01:07AM

Cookie_Monster wrote: »

don't be an idiot.

Personal abuse not welcome.

Moderator

cgcsb · 21-10-2015 10:38AM

Carawaystick wrote: »

Ah yeah, let the moon dictate when your train can run...

As opposed to burning dead dinosaurs?

MGWR · 22-10-2015 03:04AM

cgcsb wrote: »

As opposed to burning dead dinosaurs?

At least that's on-demand power, with the highest BTU content. Whether one believes the abiogenic theory surrounding it or not.

dowlingm · 23-10-2015 05:20PM

WomanSkirtFan8 wrote: »

We had a very infrequent rail service out here before the DART arrived. All we had then were the occasional Rosslare and Arklow trains and the Greystones to Bray shuttle train which operated until November 1990 when it was withdrawn amid much local protest.

If only it had been done properly - a new build double track electric-wired tunnel under Bray Head rather than string wire along the precarious (hazards above and below) single track around it.

MGWR · 23-10-2015 07:13PM

dowlingm wrote: »

If only it had been done properly - a new build double track electric-wired tunnel under Bray Head rather than string wire along the precarious (hazards above and below) single track around it.

The main line through Bray is single track just south of Convent Avenue, and a straighter main line could mean bulldozing parts of Raheen Park, never mind who knows what NIMBYs that use the golf course would say. Also, the rail bridges over Putland Road in Bray and Victoria Road in Greystones are single track, although the alignment through Greystones otherwise looks like it could accommodate two tracks.

Grandeeod · 23-10-2015 11:10PM

dowlingm wrote: »

If only it had been done properly - a new build double track electric-wired tunnel under Bray Head rather than string wire along the precarious (hazards above and below) single track around it.

Are you for real???

Carawaystick · 27-10-2015 05:28PM

Cookie_Monster wrote: »

don't be an idiot. The fact is tidal is reliable and very fixed in terms of knowing and planning outputs, especially compared to wind. to solve your imagined timing problem you could alway use it to power pumped storage or batteries to release the energy when required rather than when produced.

Like we store the wind power? How's Spirit of Ireland getting on?

Cookie_Monster · 28-10-2015 01:24AM

Carawaystick wrote: »

Like we store the wind power? How's Spirit of Ireland getting on?

What do you think Turlough hill does? Or the new proposal to use ex salt mine up north for compressed air storage?
And just because it hasn't been done yet, doesn't mean it can't / won't (just like electrification!)

Carawaystick · 28-10-2015 04:48PM

Turlough Hill stores coal generated electricity, and only a small amount, and is used for smoothing the electricity demand.
There's only one other pumped storage station planned, and its only about 1/8 of the power of Turlough Hill.
An Taisce, Salafia and Sweetman will have a field day if any serious large scale pumped storage is planned.

DC power is a bad way to electrify, as energy can't be sent back into the wire during breaking, unlike ac.

n97 mini · 28-10-2015 06:13PM

Carawaystick wrote: »

Turlough Hill stores coal generated electricity, and only a small amount,

All the hydro stations on the Liffey supply TH.

goingnowhere · 29-10-2015 10:12AM

Carawaystick wrote: »

DC power is a bad way to electrify, as energy can't be sent back into the wire during breaking, unlike ac.

Yes it can, DART has done it for 31 years

Back to the national grid is possible with modern DC traction substations, we don't have them yet in Dublin

Captain Chaos · 29-10-2015 10:59AM

The old LHB DARTs with DC motors have had re gen braking since they were built in 1983, there is no problem there.

The newer Mitsu DARTs have AC motors so they use inverters for the DC supply.

Electrification

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