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Post by version3point1 on Jul 30, 2009 20:25:50 GMT
I noticed these a couple of weeks back and still haven't worked out what these are and it's starting to niggle a bit:  Harrow-on-the-Hill, towards headwall of Platform 4. Ta.  |
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metman
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Post by metman on Jul 30, 2009 20:51:33 GMT
I was going to ask that!
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Post by suncloud on Jul 30, 2009 21:01:49 GMT
I've seen them elsewhere too. Think at Moor Park, Watford and Amersham...
They look like housings for some kit that isn't itself installed... Maybe something to do with S-stock...
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metman
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Post by metman on Jul 30, 2009 21:24:24 GMT
They are at Northwood too!
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Deleted
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Post by Deleted on Aug 1, 2009 21:54:01 GMT
I ferried a Metronet teckky down from Amersham the other day so I asked him what they are.
No idea!
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mrfs42
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Post by mrfs42 on Aug 1, 2009 22:28:38 GMT
I'd place a good guess that the yellow box under the neggy rail is the tuning unit for the new style track circuits/position detectors.
The grey things look like cable ducts, which may or may not be connected, as they are not in use at the time of the photograph.
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Deleted
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Post by Deleted on Aug 4, 2009 17:17:18 GMT
correct the yellow box is a tuning unit but to what the gray boxes are i couldnt tell you
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Post by ruislip on Aug 4, 2009 19:12:32 GMT
Any of these on the Uxbridge branch?
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mrfs42
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Post by mrfs42 on Aug 4, 2009 19:56:21 GMT
If not, there soon will be, as it is all tied in with the new stock.
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Post by suncloud on Aug 4, 2009 20:32:13 GMT
There was something in the grey box today at Watford... A black box type thing... didn't get a great look... kinda flat with a black glass looking front... maybe...
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Post by xover on Aug 6, 2009 11:01:07 GMT
First Post from a newbie ;D
Its certainly to do with S Stock. I believe the shorter ones are APD's (Absolute Position Detectors) so the platform knows exactly where the train is when berthed and transmits any other info to the train that it may need to - ie door opening/side and cut outs etc.
Thanks
XOVER
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Deleted
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Post by Deleted on Aug 6, 2009 13:35:44 GMT
i have seen these APD's and they are yellow in colour and usually housed in a metal box they are currently installed on the Vic Line and correct they will be used for CSDE and proberly for other stuff aswell but the boxs in the pics look abit too small for the ones i have seen unless westinghouse have designed alot smaller unit
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Post by ruislip on Aug 6, 2009 17:08:59 GMT
First Post from a newbie ;D Its certainly to do with S Stock. I believe the shorter ones are APD's (Absolute Position Detectors) so the platform knows exactly where the train is when berthed and transmits any other info to the train that it may need to - ie door opening/side and cut outs etc. Thanks XOVER Does this have anything to do with all the weekend closures on certain parts of the Met? |
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Post by suncloud on Aug 6, 2009 20:42:33 GMT
I think the big project at the moment is power upgrades (including the new current rails). But work on things like this are probably happening at the same time.
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Post by citysig on Aug 6, 2009 23:03:54 GMT
I would say the signalling side of things is slightly bigger at present than the power side. Certainly the reason we've been given for most of the shutdowns is "signalling works."
Mind you, where power is concerned, it's one of those things that is slipped in quietly. One minute all is quiet, the next you realise you've just gained a few extra current rail sections.
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Post by chorleywood on Aug 6, 2009 23:50:32 GMT
First Post from a newbie ;D Its certainly to do with S Stock. I believe the shorter ones are APD's (Absolute Position Detectors) so the platform knows exactly where the train is when berthed and transmits any other info to the train that it may need to - ie door opening/side and cut outs etc. Thanks XOVER I think that they might be for track-to-train OPO CCTV for the S-stock - I think I heard that instead of the radio-based system that has been used on previous installations, S-stock would receive OPO pictures via an optical link. These are in platforms, and they're being fitted with something which sounds like an infra-red emitter. Could this be it? |
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Post by xover on Aug 7, 2009 0:18:11 GMT
[/quote]
I think that they might be for track-to-train OPO CCTV for the S-stock - I think I heard that instead of the radio-based system that has been used on previous installations, S-stock would receive OPO pictures via an optical link. These are in platforms, and they're being fitted with something which sounds like an infra-red emitter. Could this be it?
[/quote]
You could well be right on the OPO cameras rather than my ludicrous suggestion ;D
Although what are the "taller" ones that are a bit further away from the platform for then I wonder?
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Post by suncloud on Aug 7, 2009 8:36:49 GMT
I would say the signalling side of things is slightly bigger at present than the power side. Certainly the reason we've been given for most of the shutdowns is "signalling works." Mind you, where power is concerned, it's one of those things that is slipped in quietly. One minute all is quiet, the next you realise you've just gained a few extra current rail sections. Maybe my view is biased with passing Croxley where the builders yard has been turned over very obviously to a base for power work. Its also quite obvious when its been done, and that you can't run a service over lines where current rails are being replaced. There is generally a lot of activity going on it seems. Was late for work one day as my amersham train at Moor Park had trundled down the slows and my connecting chiltern train got ahead of it. (I was assuming connected to the guys wandering along the down fast with hivis....) |
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Post by citysig on Aug 7, 2009 11:49:47 GMT
Maybe my view is biased with passing Croxley where the builders yard has been turned over very obviously to a base for power work. Its also quite obvious when its been done, and that you can't run a service over lines where current rails are being replaced. There is generally a lot of activity going on it seems. Was late for work one day as my amersham train at Moor Park had trundled down the slows and my connecting chiltern train got ahead of it. (I was assuming connected to the guys wandering along the down fast with hivis....) I think the current rail replacement is taking advantage of the signalling shutdowns. Rail replacement is fairly straightforward as it's simply a straight old for new swap. I was thinking more along the lines of bigger power projects, such as new substations or altered current feeding arrangements. I think the new current rails will remove some of the need for this, but I would expect that before the new trains arrive, some alteration to the way in which current is supplied would have been made. As for your Amersham running on the local, this could be for any number of reasons. The Hot Weather plan could be one. The Met train running too late to be put infront of the Chiltern but at the same time "too early" to be held until it has passed if you see what I mean. There are no booked connections during the day between Met and Chiltern services. We basically run enough trains on the majority of branches to allow people to reach places they want to catch Chilterns from to choose a service that will give them adequate time. |
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Post by suncloud on Aug 7, 2009 14:04:59 GMT
As for your Amersham running on the local, this could be for any number of reasons. The Hot Weather plan could be one. The Met train running too late to be put infront of the Chiltern but at the same time "too early" to be held until it has passed if you see what I mean. There are no booked connections during the day between Met and Chiltern services. We basically run enough trains on the majority of branches to allow people to reach places they want to catch Chilterns from to choose a service that will give them adequate time. Wasn't a particularly warm morning, so doubt it'd have been Hot Weather plan. But having been around here for some years now, I understand the behind the scenes workings and stuff... But it doesn't stop it being frustrating being in good time for a Met arrival at Moor Park, it being delayed and you see the Chiltern going through, knowing you're now half an hour later than you'd hoped to be. If it was more critical I was on time, I'd probably aim for the earlier Chiltern service when doing that particular journey. But that doesn't stop events like the failed train I was on near Watford last month that meant I ended up being nearly 3 hours late for work that day. |
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Post by citysig on Aug 7, 2009 23:10:48 GMT
Even those of us who work "behind the scenes" get caught. And for many of us if it's not with our own lines, it's with National Rail. A colleague I was working with today will agree (having finished his shift, rushed to Euston only to be confronted by the words "Cancelled."
I left work a short time after him and aimed to catch a certain train at Kings Cross... only to find that a gap that had been created due to earlier defective trains had now arrived at Baker Street. One of the big rules of controlling. Make sure your going home train is running (after first ensuring your relief's train is also running ;D ).
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Post by t697 on Aug 9, 2009 20:09:33 GMT
The grey boxy items are to mount OPO track to train transmission equipment. The low ones are for on and off commands, the taller one for the image transmitter. You can see new OPO camera masts and brackets appearing at several stations too.
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Post by railtechnician on Aug 17, 2009 15:03:14 GMT
i have seen these APD's and they are yellow in colour and usually housed in a metal box they are currently installed on the Vic Line and correct they will be used for CSDE and proberly for other stuff aswell but the boxs in the pics look abit too small for the ones i have seen unless westinghouse have designed alot smaller unit It makes sense that new CSDE kit is going to be installed as all the existing Redifon kit is approaching its expiry. I installed the original packages of CSDE on the H&C from Hammersmith to Barking in 1991/2, the supplied transmitters and loop aerials being designed for a 20 year life. My survey teams did the installation surveys for all lines except the Central (left to CLPT) and the Jubilee (left for JLE project) from 1990 IIRC but all the other installations were done by outside contractors. |
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Post by railtechnician on Aug 17, 2009 16:05:32 GMT
I think that they might be for track-to-train OPO CCTV for the S-stock - I think I heard that instead of the radio-based system that has been used on previous installations, S-stock would receive OPO pictures via an optical link. These are in platforms, and they're being fitted with something which sounds like an infra-red emitter. Could this be it? [/quote] You could well be right on the OPO cameras rather than my ludicrous suggestion ;D Although what are the "taller" ones that are a bit further away from the platform for then I wonder?[/quote] As far as I know the track to train kit on the JLE uses Redifon transmitters and presumably loop aerials just like CSDE, as you suggest a radio based system although the TT CCTV must be more complex than CSDE which transmits a single frequency (one of three for near side, off side or both sides door enable) 365/24/7 in the same way that train radio channel change beacons did rather than carrying a modulated waveband. I would think that what is being seen installed trackside is an infra red transmission system rather than a specific single system and that it will be a medium to carry many systems simultaneously. Once a reliable two way track to train transmission system is in place any number of signal and communications systems may be worked over it, CCTV and CSDE are only two possibilities but such things as true positive train ID and location become possible, real time info services etc such as 'on train' passenger info displays. Other possibilities are realtime monitoring of all onboard equipment for reliability and performance analysis, and indeed monitoring the actions of the motorman as well as certain emergency controls. |
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prjb
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Post by prjb on Oct 18, 2009 21:35:12 GMT
Sorry Guys, I completely missed this thread first time around and whilst this is 'bumping' it a bit my post is relevant. These are indeed OPO TTCCTV (Track to Train CCTV) transmitters. The system we are using is microwave based and will give unrivalled image quality. Incidentally, you currently get more ambient microwave energy in London from the Crystal Palace transmitter than you will from standing next to our OPO TTCCTV system so it is nothing to panic about.
We are using RF ID (Radio Frequency Identification) tags for CSDE and SDO, as well as other functions, in the interim until a new signalling system is installed on the SSR. These tags are being produced by an established supplier who has worked for LU previously so we will not suffer any problems that other projects have experienced. You will start to see these RF ID tags going in under the platform nosing stones adjacent to the stopping points (they are yellow boxes) over the next few months.
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