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ellendune
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« Reply #90 on: January 05, 2019, 21:16:12 » |
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So while Westbury was up to this, we on the CPRR have just commissioned the largest - and possibly tallest - ground frame in GWR▸ history to work the Platform 4 run-around loop at our mainline terminus. The new 'Princes Risborough North Ground Frame' is about 6 metres above rail level; 5 levers - 121 spare and 6 spaces! How does it qualify as a ground frame rather than a signal box? |
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Dispatch Box
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« Reply #91 on: January 05, 2019, 21:19:03 » |
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So while Westbury was up to this, we on the CPRR have just commissioned the largest - and possibly tallest - ground frame in GWR▸ history to work the Platform 4 run-around loop at our mainline terminus. The new 'Princes Risborough North Ground Frame' is about 6 metres above rail level; 5 levers - 121 spare and 6 spaces! How does it qualify as a ground frame rather than a signal box? Always thought a Signalbox had block codes, and between other boxes, a ground frame in my mind, works a local area, am I right?. |
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Oxonhutch
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« Reply #92 on: January 05, 2019, 21:53:28 » |
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How does it qualify as a ground frame rather than a signal box?
A signalbox controls entry on to the railway either through [say] absolute block working or the issuing of a single-line token. A ground frame is merely a slave - its working is released by either a controlling signal box, or in our case at present, the unlocking of the frame using the single-line token. One of my jobs today was assembling the frame release lock using the token. |
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Witham Bobby
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« Reply #93 on: January 05, 2019, 22:07:22 » |
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How does it qualify as a ground frame rather than a signal box?
Generally, we were taught, a signalbox is a place at which trains can be given or denied permission to approach or depart by communication with another such place. In general terms, a ground frame has no routine means to allow a train to arrive or depart, other than with the permission of the signalman(er) at its controlling signalbox. |
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Dispatch Box
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« Reply #94 on: January 05, 2019, 23:02:00 » |
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... I also spent many 'happy' hours at the top of a ladder making all the soldered connections on the tag blocks....   Yes it did surprise me that such a key piece required a ladder to access it. In today's world it should never be designed like that as the designer is required to take into account the health and safety of the person constructing (and maintaining) the asset. Westbury signalling dates back to 1990, I believe (when Bradford North Curve was taken out) ... suggestion (but a few years back) that it was/is due to be replaced in 2026. So you're looking at outdated racks which would not be allowed new today? Remembering it being installed in 1984, when I was going to Bristol to government centre, for unemployed people, that turned out to be a waste of public money. |
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rogerw
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« Reply #95 on: January 06, 2019, 14:08:55 » |
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I agree. Most of the Westbury area resignalling took place in 1983/84
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I like to travel. It lets me feel I'm getting somewhere.
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bradshaw
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« Reply #96 on: January 06, 2019, 14:51:11 » |
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Witham Bobby
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« Reply #97 on: January 06, 2019, 15:04:11 » |
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I agree. Most of the Westbury area resignalling took place in 1983/84
Arguably, the fisrt step was the abolition of Westbury South Box in (I think) 1978. The 99 lever frame was removed by volunteers from the West Somerset Railway, including me. We drove a truck onto site, worked inside and outside the 'box (without PTS▸ and other H&S▸ related procedure and gear) over the space of a weekend to dismantle and remove the frame. 33 levers are now in use at Bishops Lydeard, 33 at Minehead, and I can't account for the other third of the frame. Control of the junctions at Westbury South was transferred to a small panel contained in Westbury North Box. This survived until replacement by the 1984 and present Westbury Power Box. |
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ellendune
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« Reply #100 on: January 07, 2019, 18:53:31 » |
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Intriguing. So why did it need a design change and why did that need several attempts. Were the records wrong?
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bobm
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« Reply #101 on: January 08, 2019, 11:19:51 » |
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Dispatch Box
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« Reply #102 on: January 08, 2019, 13:18:41 » |
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What a pile of rubbish they have left on the slope of that platform?. Looking at the pictures, Is it right to have a signal right on the platform, thought they would of moved it to the end near to that concrete path, and in that area of ballast. Could be a spad risk where it is. Then there is time to change them during the time that the station is eventually prepared for eventual resignalling.
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bobm
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« Reply #103 on: January 08, 2019, 13:24:28 » |
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Are you talking about the third picture down? I assume it cannot be moved any further as it would then be too close to the set of points it protects.
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TonyK
Global Moderator
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The artist formerly known as Four Track, Now!
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« Reply #104 on: January 08, 2019, 14:03:59 » |
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Remembering it being installed in 1984, when I was going to Bristol to government centre, for unemployed people, that turned out to be a waste of public money.
Ah, Winterbourne! |
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Now, please!
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