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#1
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Technology for its own sake?
"Colin McKenzie" wrote in message
... Jack Taylor wrote: ... GPS is only there to cope with short platforms and to tell the train *which* doors to open. Which begs the question: Is it accurate enough to know if the driver mischievously or carelessly stops with the _rear_ 7 cars in the platform?! The obvious solution seems to be individual doors which check that there is a platform adjacent before opening. The basic idea seems very easy to implement, although a foolproof system which could never mistake the sides of a bridge for a platform might be harder to implement, but in combination with driver control it should be safe enough. -- John Rowland - Spamtrapped Transport Plans for the London Area, updated 2001 http://www.geocities.com/Athens/Acro...69/tpftla.html A man's vehicle is a symbol of his manhood. That's why my vehicle's the Piccadilly Line - It's the size of a county and it comes every two and a half minutes |
#2
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Technology for its own sake?
"John Rowland" wrote in message ... The obvious solution seems to be individual doors which check that there is a platform adjacent before opening. The basic idea seems very easy to implement, although a foolproof system which could never mistake the sides of a bridge for a platform might be harder to implement, but in combination with driver control it should be safe enough. Something along the lines of a transponder at the start of each platform which is detected by each door and enables the doors on the appropriate side, and another one at the end of each platform which disables each door. Other interlocking means that doors cannot actually open until the train has stopped, and failsafe precautions could cancel the enabling if the train hasn't stopped within, say, one minute of passing the transponder. Some complications for platforms on reversible lines, but I can't help thinking that something like this has the potential for being more reliable than the GPS technology (Can GPS identify which line the train is on if adjoining platforms are different lengths?) Peter |
#3
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Technology for its own sake?
"Peter Masson" wrote in message
... "John Rowland" wrote in message ... The obvious solution seems to be individual doors which check that there is a platform adjacent before opening. Something along the lines of a transponder at the start of each platform which is detected by each door and enables the doors on the appropriate side, and another one at the end of each platform which disables each door. Some complications for platforms on reversible lines Ware springs to mind, and most termini. That sounds high-tech enough to break down a lot, and requires fitting of kit at stations, which are the most easily vandalised part of the railway. I was thinking of a projecting metal arm under each train door which prods the platform. -- John Rowland - Spamtrapped Transport Plans for the London Area, updated 2001 http://www.geocities.com/Athens/Acro...69/tpftla.html A man's vehicle is a symbol of his manhood. That's why my vehicle's the Piccadilly Line - It's the size of a county and it comes every two and a half minutes |
#4
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Technology for its own sake?
John Rowland wrote:
"Peter Masson" wrote in message ... "John Rowland" wrote in message ... The obvious solution seems to be individual doors which check that there is a platform adjacent before opening. Something along the lines of a transponder at the start of each platform which is detected by each door and enables the doors on the appropriate side, and another one at the end of each platform which disables each door. Some complications for platforms on reversible lines Ware springs to mind, and most termini. That sounds high-tech enough to break down a lot, and requires fitting of kit at stations, which are the most easily vandalised part of the railway. I was thinking of a projecting metal arm under each train door which prods the platform. Is it too easy to simply extend the platform? |
#5
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Technology for its own sake?
John Rowland wrote:
"Peter Masson" wrote in message ... "John Rowland" wrote in message ... The obvious solution seems to be individual doors which check that there is a platform adjacent before opening. Something along the lines of a transponder at the start of each platform which is detected by each door and enables the doors on the appropriate side, and another one at the end of each platform which disables each door. Some complications for platforms on reversible lines Ware springs to mind, and most termini. That sounds high-tech enough to break down a lot, and requires fitting of kit at stations, which are the most easily vandalised part of the railway. I was thinking of a projecting metal arm under each train door which prods the platform. Considering the range of actual platform dimensions, that is quite a large prod. Plus all the gear to ensure it is proved retracted and locked whilst the train is moving..... Chris -- Chris J Dixon Nottingham UK Have dancing shoes, will ceilidh. |
#6
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Technology for its own sake?
Chris J Dixon wrote:
Ware springs to mind, and most termini. That sounds high-tech enough to break down a lot, and requires fitting of kit at stations, which are the most easily vandalised part of the railway. I was thinking of a projecting metal arm under each train door which prods the platform. Considering the range of actual platform dimensions, that is quite a large prod. Plus all the gear to ensure it is proved retracted and locked whilst the train is moving..... Or one of those detector thingies they have on the back of BMWs to detect an obstruction whilst you're backing.. No moving parts. -- Chris Game "Hopefully the net-dwelling paranoid delusional conspiracy theorists won't descend upon me " -- Chris Pratley, MSFT. |
#7
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Technology for its own sake?
--- "Chris Game" wrote: Or one of those detector thingies they have on the back of BMWs to detect an obstruction whilst you're backing.. No moving parts. Why bother with a hardware solution at all? It can all be done with software. The onboard computer already has a list of stations that the train will be calling at, for the scrolling electronic displays: "This train calls at..." It also has to keep count of which stations it has already called at, so it can update the displays each time: "The next station is..." Just use that information to decide whether or not to open the doors at each station. Problem solved. |
#8
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Technology for its own sake?
"Solar Penguin" wrote in message ... The onboard computer already has a list of stations that the train will be calling at, for the scrolling electronic displays: "This train calls at..." It also has to keep count of which stations it has already called at, so it can update the displays each time: "The next station is..." Just use that information to decide whether or not to open the doors at each station. Problem solved. Until a security alert closes a station so the train doesn't stop there and then the count is off by one. Dave. |
#9
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Technology for its own sake?
On Thu, 23 Sep 2004 15:57:55 +0000, Peter Masson wrote:
(Can GPS identify which line the train is on if adjoining platforms are different lengths?) Not with any certainty. Of course, what happens if the Pentagon decided to turn off GPS for civilian use without warning (which they've always stated they have the right to do)? Or worse, they have a war and introduce deliberate errors into the system designed to confuse the enemy? I can see it now on the 9:24 from Tonbridge: "We will shortly be arriving at Copenhagen, please mind the step" I know that Europe is going to deploy it's own GPS sats, but I don't know when that will be. Timbo |
#10
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Technology for its own sake?
In message , Tim
writes On Thu, 23 Sep 2004 15:57:55 +0000, Peter Masson wrote: (Can GPS identify which line the train is on if adjoining platforms are different lengths?) Not with any certainty. Of course, what happens if the Pentagon decided to turn off GPS for civilian use without warning (which they've always stated they have the right to do)? Or worse, they have a war and introduce deliberate errors into the system designed to confuse the enemy? I can see it now on the 9:24 from Tonbridge: "We will shortly be arriving at Copenhagen, please mind the step" I know that Europe is going to deploy it's own GPS sats, but I don't know when that will be. Timbo The European system is already being deployed, the first satellite is already up (of course you need at least 4 for a good position), forgotten the name of the system though.. The Russians have their own system called GLASNOSS and the Chinese have also started sending up satellites so they have their own version as well. -- Regards, James Christie "In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move." - Douglas Adams |
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