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Post by A60stock on Nov 6, 2017 12:42:56 GMT
I was looking at some videos on Drivers eyes views over the manchester metrolink and a few queries came to mind:
1. Some of the lines seem to use the standard British rail colour light signalling on the lines which were formerly run by british rail, are these the same signals which have been left?
2. I also notice that on these lines, trams can literally get right up close next to each other (as standard on the road sections), was the signalling amended to let this happen? I cannot imagine that when the lines were run by BR, trains could get that close
Perhaps some clarification over how the signalling works throughout the system would make sense
thanks,
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rincew1nd
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Post by rincew1nd on Nov 6, 2017 13:09:32 GMT
1 Yes.
2 Not quite sure what you mean here, can you provide an example?
It is worth noting that a few years back the entire tramway was resignalled to allow a greater frequency of service; AIUI the whole network now operates on the "line of sight" principle, the former BR signal heads are all bagged out-of-use.
NB. The above is based solely on my own observations, given that this is a London UndergrounD forum you may get a better answer elsewhere.
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Post by trt on Nov 6, 2017 13:19:00 GMT
Is the OP asking are the trams block or TBTC signalled to prevent collisions? To which the answer I suspect is "Occupied block and section control on trams? What are you on about?"
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rincew1nd
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Post by rincew1nd on Nov 6, 2017 13:27:52 GMT
Is the OP asking are the trams block or TBTC signalled to prevent collisions? To which the answer I suspect is "Occupied block and section control on trams? What are you on about?" They used to be! The former BR signalling was retained on the original lines, before all this new-fangled "line of sight" stuff came along! |
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rincew1nd
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Post by rincew1nd on Nov 6, 2017 13:33:42 GMT
Apologies for the double post. Putting "Manchester Metrolink Signalling" into your favourite search engine yields this interesting article: www.lrta.org/Manchester/signalling.htmlI stand by my comments that this forum might not be the best place to seek your answer. |
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Post by A60stock on Nov 6, 2017 13:55:32 GMT
1 Yes. 2 Not quite sure what you mean here, can you provide an example? It is worth noting that a few years back the entire tramway was resignalled to allow a greater frequency of service; AIUI the whole network now operates on the "line of sight" principle, the former BR signal heads are all bagged out-of-use. NB. The above is based solely on my own observations, given that this is a London UndergrounD forum you may get a better answer elsewhere. regarding point 2, what i meant is that can trams get right next to each other i.e 0 min headways, or will they be required to maintain some distance between each other such as when the lines were operated by british rail trains. I saw a video where one tram was right behind the one infront, like you see with cars in traffic and was wondering how colour light signalling based on the days of BR would allow this? |
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rincew1nd
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Post by rincew1nd on Nov 6, 2017 14:23:53 GMT
For a period there were sections using block signalling with red/green signals and sections using line of sight operation. Trams would change mode, usually at station stops
AIUI there wasn't any kind of hybrid system, it was either one or the other. The operation you describe of trams being close to each other would have been line of sight signalling.
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Post by 35b on Nov 6, 2017 17:58:59 GMT
1 Yes. 2 Not quite sure what you mean here, can you provide an example? It is worth noting that a few years back the entire tramway was resignalled to allow a greater frequency of service; AIUI the whole network now operates on the "line of sight" principle, the former BR signal heads are all bagged out-of-use. NB. The above is based solely on my own observations, given that this is a London UndergrounD forum you may get a better answer elsewhere. regarding point 2, what i meant is that can trams get right next to each other i.e 0 min headways, or will they be required to maintain some distance between each other such as when the lines were operated by british rail trains. I saw a video where one tram was right behind the one infront, like you see with cars in traffic and was wondering how colour light signalling based on the days of BR would allow this? It wouldn’t, and a trip on a Manchester tram will demonstrate the operation on line of sight principles in town or on reserved alignments. |
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Post by brigham on Nov 7, 2017 8:47:35 GMT
Is the OP asking are the trams block or TBTC signalled to prevent collisions? To which the answer I suspect is "Occupied block and section control on trams? What are you on about?" There is, bizarrely, a section of the tramway at Beamish Museum (Co. Durham), which is controlled by Tyer's token machines. This is a localised safety requirement, because of a steep single-line section. The objection to it is that the token instrument is in a roadside cabinet, and when in use can be seen by the public; leading to what I call a 'miscarriage of history'. It would only take a 90-degree shift of the cabinet to fix the problem; as usual, nobody is listening. I fear this museum is in danger of becoming a 'theme park'. |
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