phoenixcronin
Member
I'm on 700112 now and the PIS hasn't been working since Blackfriars, all the way down to Brighton. No announcements no visual, completely dead
How many of them times are probably where physically it looks fine but the TMS says "No chance mate!"?
Another week, another new Thameslink Desiro City on transfer. On August 23, Europorte EURO 4000 4002 brought the brand new 700018 to Calais. It was delivered to the UK a day later.
On August 16, Europorte 4002 passed Morbecque with another Desiro City destined for service on the Thameslink route in the UK. The unit in question was 700 101, a twelve-car set.
Thanks to Class377/5 for posting the Bank Holiday diagrams. Will the Saturday ones continue thereafter?
Bank holiday eh...? Definately a first so must get out! Haven't heard if my last pics are wanted yet in one of the railway rags... I'll have another shot Monday
While I haven't seen it will, I'm sure it will as five 387/2 leave Thameslink this weekend (two are effectively gone already). The 387 diagrams were 26/25 on Saturday up to now, come Tuesday there is only 23x 387 on Thameslink so the 700s are going to take up the slack.
Front three coaches of 700110 were locked out of use on the 16:12 London Bridge to Brighton
How were they locked out of use? Is there a divider that comes out?
Front three coaches of 700110 were locked out of use on the 16:12 London Bridge to Brighton
Any reason why?
Where are they going? GN?While I haven't seen it will, I'm sure it will as five 387/2 leave Thameslink this weekend (two are effectively gone already). The 387 diagrams were 26/25 on Saturday up to now, come Tuesday there is only 23x 387 on Thameslink so the 700s are going to take up the slack.
Where are they going? GN?
Where are they going? GN?
Oh yes I forgot there are Red 387s still on TL.I would think the 387/2's are going to GatEx duties replacing Class 442s going off lease...
Do you mean on the MML? I believe it's because they are worried about interactions between the OHLE and pantographs at that speed. Current draw may also come in to it.Any reason why they are limited to 100mph ?
Do you mean on the MML? I believe it's because they are worried about interactions between the OHLE and pantographs at that speed. Current draw may also come in to it.
The 387s have been 100mph on MML for simple reason is the MML wires are designed for 100mph max so working beyond this would have required money spending.
Didn't ask about 387's so not sure if thats relevent.
Long term the restriction will be removed once they rewire the MML to deal with 125mph EMUs. But that's a way off yet.
Why does it need a rewire ? is there a technical restraint with the OHLE ?
Being new and shiney has nothing to do with max speed.
Why build anything less than the best ? I have a crappy EMT unit going past me and I'm in the new shiny train. Why settle for mediocrity ? Why not build a unit that can go as fast as possible ?
The units much meet a certain standard for crash worthiness. No reason why the 700s should be been designed for over 100mph as it would barely be used.
Other than every day ? Or are the 700's restricted to the up slow lines ? I use the fast lines in a 319 are the 700's going to be restricted to use the slow only ? seems wasteful to say the least that a unit cant go linespeed on the lines its available to use on a daily basis. The clock has 110
Due to better acceleration you already get a performance over other 100mph. Plus the fact higher speeds means a bigger cab so you start losing passenger space.
How big is the cab compared to EMT's units ? It was certainly more spacious than a 319; which is capable of 100mph
Boils down to its, the best soluation is to work on 100mph now like existing stock.
I never saw the Driver take full power. The unit really feels like it has so much more to give. It feels like the 100mph cap is artificial rather than what the unit is capable of.
Again, why are we settling for less than what we could achieve ? We were 10mph under linespeed
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It will depend on the pantograph in question, the number of them and what OHLE they are interacting with.
What pantograph do the 700's have do you know ? I only know of 2 so I'd happily be enlightened.
I don't know the specifics of the 700s, but as far as I know all electric traction on the MML is restricted to 100mph, hence work is required to improve the existing OHLE south of Bedford to allow for 110-125mph electric traction.
Ok, so if a 700 was not on the MML and was on a line that was 100mph + with upgraded OLHE. Could it go faster ? The restriction is on the unit, not on the line its on.
Is there anywhere with 100mph + OHLE ?
Technically what's the problem (please blind me with science) ?
Cheers in advance.
Com.
What pantograph do the 700's have do you know ? I only know of 2 so I'd happily be enlightened.
Ok, so if a 700 was not on the MML and was on a line that was 100mph + with upgraded OLHE. Could it go faster ? The restriction is on the unit, not on the line its on.
Is there anywhere with 100mph + OHLE ?
Technically what's the problem (please blind me with science) ?
Cheers in advance.
Com.
I believe they have Bracknell Willis HS pantographs,
but haven't found any official documentation to verify that for sure.
Of course it could probably run faster, but there's a multitude of other reasons they could be restricted. Perhaps Siemens' inside-frame bogie design has only been rated for that speed in normal service. Perhaps the front does not meet crash-worthiness regulations for higher speeds. Perhaps at a higher speed rhey would have a larger kinematic envelope. There's so many factors that could mean a restriction of 100mph.
If you want science, I highly recommend reading this book on railway vehicle dynamics. It's well written with a wealth of information.
http://www.amazon.co.uk/dp/0849333210/ref=cm_sw_r_tw_awdl_x_fEoWxb0R3E28J
Capable of how fast....
I'll check my traction manual.
Cheers, thanks and, mucho gratis. It's a unit restriction for sure rather than restricted to the MML otherwise I'd guess that the unit would state Max XXXX and then we would get a notice to state the restrictions.
Cheers, I may well do. (I usually wait for Marky T's awesome explanations)
When I first arrived on this forum. AC was highly touted to be superior to DC and that its capable of higher speeds and higher acceleration. To suddenly see AC having a speed restriction of 100mph felt a little odd to say the least.
You need to also note that on some routes DC is limited to 70mph and there is only a few DC routes where 100mph can be done.