Deleted
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Post by Deleted on Aug 2, 2018 14:41:02 GMT
I seem to remember reading some time ago that there was a driving turn on the Northern where you would drive in to Burroughs tunnel, stop, and wait for the radio confidence tone to sound, or was it a pa test, or was it sitting and waiting for the opo alarm? I think this was Pre connect radio.
Can someone enlighten me?
If that is the case, is/was the same thing done on the Central and Jubilee lines?
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Post by greatkingrat on Aug 2, 2018 16:58:41 GMT
In the WTT the 0537 Golders Green - Kennington has a note saying an extra 3 minutes are allowed for a full Radio Alarm Test to be carried out at Hampstead. All the deep level tube lines have similar tests booked in the timetable.
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Post by Dstock7080 on Aug 2, 2018 17:26:47 GMT
All the deep level tube lines have similar tests booked in the timetable. All Lines now have radio alarm tests scheduled in the Timetable.
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Post by Deleted on Aug 2, 2018 18:51:25 GMT
A full radio alarm test then was/is, stopping somewhere and waiting for the confidence tone?
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Colin
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Post by Colin on Aug 5, 2018 19:32:18 GMT
After 60 seconds of a given train being stationary and the CBTC (Combined Traction Brake Controller) not being touched by the driver, an alarm will begin to sound in the cab.
After 30 seconds of this alarm sounding and no response from the driver (by twisting the CBTC) an emergency call is automatically sent to the relevant Line Controller (or signaller on National Rail).
This is called the OPO Alarm and with S stock being so fitted, all LU rolling stock has this feature.
The radio alarm test is to basically sit there and allow the system to automatically send that emergency call. The relevant Line Controller (or signaller on National Rail) will then make a PA broadcast on the relevant train and if successfull that completes the test.
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Post by davethewomble on Aug 6, 2018 13:22:37 GMT
The test as described proves that one train can make perform the required emergency action at one location. Presumably there are other measures in place to give confidence that in an emergency situation, any train would be able to make the emergency call from wherever it found itself on the network?
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Colin
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Post by Colin on Aug 6, 2018 14:16:31 GMT
Its not practical to test all 500 or so trains out on the network every single day.
It should be noted that there are usually several scheduled tests in the timetable, both early morning and late evening & spread across each given line.
Taking the District as an example there's a midday test scheduled in Barking sidings (actually a Hammersmith & City line train is designated), and late evening tests are scheduled at High Street Kensington, Richmond and Wimbledon.
As rolling stock is rotated (no train works the same schedule two days on the bounce) it'll get its test.
The system can also be tested at any time within depots or at terminus's if a fault is suspected - and indeed there's often "unofficial" tests when drivers forget to remove their keys from the cab (or fail to acknowledge the alarm correctly) before changing ends.
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Post by Deleted on Aug 6, 2018 17:31:14 GMT
Its not practical to test all 500 or so trains out on the network every single day. It should be noted that there are usually several scheduled tests in the timetable, both early morning and late evening & spread across each given line. Taking the District as an example there's a midday test scheduled in Barking sidings (actually a Hammersmith & City line train is designated), and late evening tests are scheduled at High Street Kensington, Richmond and Wimbledon. As rolling stock is rotated (no train works the same schedule two days on the bounce) it'll get its test. The system can also be tested at any time within depots or at terminus's if a fault is suspected - and indeed there's often "unofficial" tests when drivers forget to remove their keys from the cab (or fail to acknowledge the alarm correctly) before changing ends. Or when testing in depots and you set the alarm off by mistake >.>
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