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November 21, 2018, 12:39:58 pm *
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[125] Four track for Filton Bank - ongoing discussion
[53] The line to the Severn Tunnel. Future use for the area it pass...
[19] When did the last slammers leave?
[17] Worcestershire Parkway Station project - ongoing discussion
[15] Metrowest Status
[12] MetroBus
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1  All across the Great Western territory / Looking forward - 2019 to 2045 / Re: The line to the Severn Tunnel. Future use for the area it passes through on: Today at 11:33:36 am
Worth looking at this document for a bit of local colour; it refers to a new station on Filton Bank which, at 1:75, is (I think) steeper than the line past Aztec West:

Quote
The existing gradient for all three station locations on the Filton Bank is very steep (1 in 76 or 1.33%). Group standard GI/RT/7016 states that: “ Wherever possible, platforms shall be located on track with an average gradient not steeper than 1 in 500. It is permissible for platforms to be located on track with average gradients steeper than 1 in 500 provided trains are not planned to terminate or reverse at the platform” . This is guidance rather than a definitive requirement, but 1:75 is still is considered too steep for a new station to be developed on. Guidance note GI/GN7616 provides further information for consideration of risks associated with proposing platforms relating to horizontal curvature and longitudinal gradients.

Vertical track positioning can be adjusted through track lifts and earthworks to re ‐ profile gradients. However, as the provision of a 1:500 platform gradient would lead to excessive gradients on either side of the station, it was decided to target a station gradient of 1:220 (0.45%). This is consistent with a station gradient deviation granted for (the reopened) Corby station (Certificate number 07/182/DGN). Designs using this 1:220 gradient are much more likely to be accepted by Network Rail (NR) even though still requiring some deviation from guidance in the group standards. They do however lead to significant works in terms of Permanent Way and track drainage, signalling, earthworks and electrification.

It would be possible to seek deviations from standards for the existing (much steeper) gradient through the station, which would reduce the requirement for Permanent Way works and their associated costs, but this is considered unlikely to be practical that such a deviation would be granted. Costs have therefore only been developed for designs producing a 1:220 gradient through the station sites.

It should be considered that failing to achieve a derogation that the 1:220 gradient through a station is acceptable could significantly change the requirements at each station, and thus would require re ‐ assessment of the assumptions in this report.
2  Journey by Journey / Bristol Commuters / Re: Four track for Filton Bank - ongoing discussion on: Today at 10:24:30 am
Three Tracks (in the old Midland Shed), Now!  Wink

Three? Are you planning for a releasing road?

Oh, of course; we'll need to cater for all those kettles they insist on in today's modern railway..! Smiley
3  All across the Great Western territory / Looking forward - 2019 to 2045 / Re: The line to the Severn Tunnel. Future use for the area it passes through on: Today at 10:18:19 am
I worked at Aztec West for a few years in the early 00's and the only form of transport that seemed to make any sense was the bicycle: Buses took impossibly long, convoluted routes, it was too far to walk, and while the controlling assumption is that 'everyone drives' this in practice didn't work very well either. Despite huge car parks there weren't enough spaces (where do you go if you can't park? Almondsbury?), and despite high-capacity signal-controlled junctions the congestion was really bad.

Obviously this (together with any plans for Pilning) has to be seen in the wider context of MetroWest; when I worked there a lot of people came in from Newport, Nailsea, Yate and Thornbury - is it fair to assume that this is still the case? I am tempted to find a comfortable armchair, sharpen my crayons, and try to work out how a Thornbury-Aztec West flow might be catered for, but maybe I'm getting ahead of myself...

This is exciting stuff, grahame!

4  Journey by Journey / Bristol Commuters / Re: Four track for Filton Bank - ongoing discussion on: Today at 09:43:30 am
Hmm... don't get me wrong, 'Tony' is a decent-enough name, but it doesn't have quite the same ring as 'Remodel Bristol East Junction, Now!'...
5  Journey by Journey / Bristol Commuters / Re: Four track for Filton Bank - ongoing discussion on: Today at 08:51:49 am
This article expands on Four Track, Now!'s explanation, though perhaps not as much as you might have hoped.

Just by way of an example, trains on the Severn Beach line start at 2K00, the 05.14 from Temple Meads to Avonmouth, and in general terms the code rises through the day (so as I type this 2K09, the 08.36 from Avonmouth, has just departed on its way to Temple Meads). However 'K' is also used as a route indicator by Scotrail, and whilst you (or indeed signallers) are unlikely to confuse a train on the Fife Inner Circle for the Severn Riviera Express, it is worth recognising that these codes are not unique.
6  Journey by Journey / Bristol Commuters / Re: MetroBus on: Yesterday at 09:53:26 pm
As if by royal command I have just taken a look at the Bristol Post website on my mobile and there is a repeat of the artists impression of the GPL bridge that I referred to in an earlier post this evening. This does. as my earlier post stated, show a single decker travelling towards the artist but as if to validate the artists impression a double decker has been added in this published version. Looking at the headroom remaining over the top of the single decker I doubt whether the double decker would emerge the other side of the new GPL bridge without conversion to a. err. open topper. Also artists licence has given the artist responsible for this impression the vision to install the overhead catenary over the projected rail overbridge. seemingly, just one Metrobus length apart.

By the way, January 9th is the start date of route m1, brought forward a week to coincide with the start of the University's new term. It was previously announced as commencing on January 16th.

I agree. It's a shame their artist didn't hang around to imagine the subsequent carnage. Let's hope that when they build it, they choose to follow the plans - allowing 5.8m headroom - rather than the Evening Bristol's artistic rendering of them:



Image: Bristol Post
7  Journey by Journey / Bristol Commuters / Re: MetroBus on: Yesterday at 09:23:07 pm
Wouldn't it be a better idea to reopen the railway through the airfield to passenger traffic instead?

No.

When Gipsy Patch Lane bridge was built there was no airfield, no factories, no Regional Shopping Centre, no Bradley Stoke or Charlton Mead, no UWE; Yate and Filton were villages... as the area has developed, all this traffic has had to squeeze through a narrow arch designed to cater for a couple of horse-carts a day. It should have been replaced decades ago.

It goes without saying that I agree that the Henbury Loop should be reopened quickly, but actually if I had to phase it I would probably do Gipsy Patch first.
8  Journey by Journey / Bristol Commuters / Re: Metrowest Status on: Yesterday at 07:01:04 pm
Looks like the Bristol Bath Cycle path is doomed to a Metrobustrocity. Haven't they learnt yet?

Whether they've learnt or not, the cycle path is indicated as non-MetroBus rapid transit.
9  Journey by Journey / Bristol Commuters / Re: MetroBus on: Yesterday at 06:58:44 pm
I'm not sure if it's been mentioned already, but the Brizzle Post is reporting that the recently-struck Gypsy Patch Lane Bridge will be shut for two years (or perhaps 344 days, they mention both periods of time) while the bridge is rebuilt to allow the Metrobus under it. But they make no mention of whether rail services will be disrupted.
https://www.bristolpost.co.uk/news/bristol-news/road-bristol-going-closed-two-2235378

I have looked into this and seen the plans for the bridge. It is a four lane roadway with the two inner lanes being the Bus Lanes. The two years mentioned is for the roadworks and preparatory work for the new bridge itself which would allow the passage of double deckers. Network Rail were quoted as indicating the bridge overbridge itself would be installed over a prolonged block, probably Easter 2018, yes 2018 and the pre-fabricated box section was to be built on the adjoining former Rolls-Royce site but now, from my observations, construction of industrial units is taking place on the site now so Network Rail has missed the boat on that plan. More recently I've seen an artists impression of the finished new bridge and it shows a Metrobus vehicle in the illustration, a single decker. I'll try and post a link to the S. Glos. web site to view what i've described above.

Go to https://developments.southglos.gov.uk/online-applications/ and search for PT18/0986/F . Lots to see!

These plans were passed by South Glos in July 2018.

The Indicative Compound Layout, dated Feb 2018, shows access via a compound west of the railway and south of Gipsy Patch Lane.

The headroom looks to be 5.8m; more than enough to fit a decker through. This will be achieved by digging down somewhere around 1-2m below the current road level.
10  Journey by Journey / Bristol Commuters / Re: Metrowest Status on: Yesterday at 05:32:19 pm
Were they talking about the JSP? It is worth looking at the infrastructure statement as updated in April 2018 (here), if you haven't already; the map in Figure 3 gives some indication of what is on the table - stations at St Anne's, Saltford, Ashley Hill, Ashton and Charfield, 'rapid transit' (not MetroBus) to the Airport, north-west Bristol, along Bath Road and - oh, along the Bristol-Bath cycle path by the look of it... lucky old Thornbury might get MetroBus and a cycle path (they must have upset someone!).

Edit: Oops! No points for proofreading
11  Journey by Journey / Bristol Commuters / Re: Metrowest Status on: Yesterday at 05:19:07 pm
BBC Radio Bristol news bulletins today have Banes Council and our Marv talking about tram/train or light rail options between Severn Beach and Westbury. Probably a bit more of their occasional headline attention grabbing stuff or equally possibly an excuse for further inaction but worth mentioning I thought.

Given that BaNES are involved, I presume we're talking about Westbury, Wilts rather than Westbury-on-Trym... in which case, unless my rail atlas is out-of-date, isn't there already a heavy rail connection?
12  Journey by Journey / Bristol Commuters / Re: MetroBus on: Yesterday at 11:08:16 am
I'm not sure if it's been mentioned already, but the Brizzle Post is reporting that the recently-struck Gypsy Patch Lane Bridge will be shut for two years (or perhaps 344 days, they mention both periods of time) while the bridge is rebuilt to allow the Metrolbus under it. But they make no mention of whether rail services will be disrupted.
https://www.bristolpost.co.uk/news/bristol-news/road-bristol-going-closed-two-2235378

Just to be clear, this is not Hatchet Road bridge (the one by Parkway which was hit by a bus the other day) but Gypsy Patch Lane bridge, which is to the north-west on the South Wales line. I think this is another example of Metrobus money being used to fund a long-overdue road improvement - it'll be much safer for cyclists and pedestrians too.
13  Journey by Journey / Bristol Commuters / Re: Something rather special - near Bristol - 16th Feb 2019 on: Yesterday at 10:38:16 am
Ooh, is that an RE or an LH?

Isn't LH just a Bristol RE variant? Long (36ft) and High frame.

https://en.m.wikipedia.org/wiki/Bristol_RE#Variants

No. LH ≠ RELH

https://en.m.wikipedia.org/wiki/Bristol_LH
14  Journey by Journey / Bristol Commuters / Re: Something rather special - near Bristol - 16th Feb 2019 on: Yesterday at 12:02:44 am
Ooh, is that an RE or an LH?
15  Journey by Journey / Bristol Commuters / Re: Four track for Filton Bank - ongoing discussion on: November 19, 2018, 05:27:07 pm
Possibly not what people had in mind when they asked for more pictures, but here's what today meant to me.

First is Clifton Down, getting back to its busy self;
Second: School run completed, stress-free, for the first time in weeks!
Finally: Pity they couldn't have done something about this while they were at it...
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