是咁的，
見到隔離板每次一有呢d問題就會嘈生晒，好多人唔係話地鐵睏綁撥款，於是今次同大家講下點解沙中線同APG嘅撥款要一齊，就唔好學果位議員咁啦
：
http://hkcitizen.net/wordpress/?p=2487
~24分鐘開始講呢個問題

如果板友想講有關絪綁撥款,不妨係呢度講多少少點由呢段錄音點引伸呢個議題?

如果板友要宣傳節目,麻煩請移玉步到511 網頁更新

SIBAS32 :如果板友想講有關絪綁撥款,不妨係呢度講多少少點由呢段錄音點引伸呢個議題?

如果板友要宣傳節目,麻煩請移玉步到511 網頁更新

唔好玩啦版主大
我又唔係甜甜．．．仲有腦嘅
我其他集數不嬲響511出，呢集因為講左關於鐵路嘅野，咁就希望帶起下討論咁
好過講都無人講

同埋又提番羅湖個 MGF

不過其實你可唔可以講講段廣播關於咩內容？
我相信唔會阻你好多時間姐
咁樣一來無聽既版友都可以作出討論 , 二來想更深入去了解既版友可以禁你個連結聽完再發表意見 ~

Phenolphthalein :不過其實你可唔可以講講段廣播關於咩內容？
我相信唔會阻你好多時間姐
咁樣一來無聽既版友都可以作出討論 , 二來想更深入去了解既版友可以禁你個連結聽完再發表意見 ~

Different host of the show have mentioned the key problem of signaling response speed.

Whatever the implementation of MGF, PSD or AGP, all of them have suffered fail of open or closes on East Rail (Line). PSD on EAL used to be communicate with VOBC by RI of TBL. However this bridge is always unreliable. You may note sometimes drivers have to make his announcement for late opening PSD or saloon door just after the train was came to a standstill in ETS in the old days from passengers' view. This is an very obvious example to prove RI have failed to be bridge between ground / ATO stop loop to train communication.

The second point is, there is no way to separate the bill of SCL project and APG work, since APG must be implemented with new NSL signaling system like Cityflo650.However we have to understand trains running on "oldest MTR stations" which providing services since 1979 have different signaling system. You must have ever experienced the age of 逼地鐵in the 80s and the 90s, and why today we don't have such chaos is MTR did a signaling upgrade in 96/97/98 for TWL/ISL and Kwun Tong Line respectively.

Although KCR did the same work in 1998, the signaling is two different world actually. MTR is using a french built signaling called SACEM which have quick response and crowded operation. For East Rail Line, the system we're using today called TBL was designed for mainline railways like what we can see in UK. If you have ever been to UK, you will know what kind of train services I'am talking. The difference is, MTR can run 32-34 train per hour and East Rail Line can only run ~24. Try to imagine, MTR SACEM is a 2000' Xeon 1G Server and East Rail Line only have a single CPU PII computer running a windows 98.

Ok, so why APG related to signaling system?

First of all, once the train was standstill. Trainborne computer or we call it as VOBC will send a signal to ground based component of signaling system. Signaling system will tell APG: Safe to Open. Then the train operator, what we call 車長in chinese will open train doors, a remote will tell APG to open simultaneously.Once the APG was opened, APG will tell TBL "I was opened", TBL ground component will send a signal to VOBC that "You are not allowed to move, target speed and permitted speed for you is 000" .Once APG was all closed, this APG will though same process again to make sure everything is normal.

There was a trial conducted by KCR just after the rail merger, to test the platform gap filler in Lo Wu station indicated that all this kind of operations will cause every train delay ~20 seconds for every station stop because of the signaling system was giving out slow response and this limitation is 先天性 since TBL was not designed to do so

And the delay wasn't included any passengers step on it and stopped whole APG system while the gap filler was going to retract by the time.

I hope I have tried my best to explain the issue. And... the old word: 唔明再問

Thank you MM@! for your cooperation with Board Moderators' instructions and giving us a very detail introduction about the issues on AGP.

MM@! :I hope I have tried my best to explain the issue. And... the old word: 唔明再問

as a supplement, RI means Radio Infill for TBL. The RI was a wireless infill loop compare with traditional infill loop of ATP or 點制御 system. The aim of RI implementation is to reduce update time of LOMA and transmitting further information of block. The disadvantages of 點制御 system usually could be observed by : when train A is following the preceding train B which was standstill , train A will easily stopped by aspect of signal or the end of LOMA. Even though train B has already left the platform, train A still have to decrease it's speed to 0 until it's reaching the home signal beacon and updated by that beacon "PLatform has been cleared". But if we can install a infill just some distance before home signal, train A will able to continue it's running speed or don't even have to decrease it's speed to 0 but getting the new LOMA with immediate action.

(You may refer to http://yuuji.wordpress.com/2009/09/18/etcs/ for what infill loop is)