The most logical network for the backup handhelds to use is the 400MHz
Government Radio Network (GRN). Whether that Is the case I have not yet
heard. GRN allows individual calls and group calls Talk groups etc etc.
On Wednesday, 15 March 2023 at 12:28:12 UTC+11peterm...@... wrote:
> May or may not relate to the cause of the failure but the DTRS gear is all
> due for replacement in the next few years as part of its normal lifecycle
> replacement schedule.
>
> On Tuesday, 14 March 2023 at 17:01:52 UTC+11 Hunslet wrote:
>
>> Doubtless not the same today, but 50 years ago (!), the Department of
>> Railways etc was a self-insurer. Didn’t even use the Government
>> Insurance Office!
>>
>> Hunslet
>>
>>
>>
>> *From:*tramsdo...@... [mailto:tramsdo...@googlegroups.com] *On
>> Behalf Of *Stuart Keenan
>> *Sent:* Tuesday, 14 March 2023 4:52 PM
>> *To:*tramsdo...@...
>> *Subject:* Re: [TramsDownUnder] Follow up on the DTRS failure last week
>>
>>
>>
>> Just wondering if it has something to do with their public liability or
>> other insurance?
>>
>>
>>
>> I imagine that Sydney Trains would have negotiated a reduced premium with
>> their insurer once the DTRS was operational as it represents an extra layer
>> of safety. I can also imagine the insurer saying something like "Yep, no
>> worries we'll lower your premium but you gotta have this radio on 24/7. If
>> it stops, so do your trains".
>>
>>
>>
>> Anyone know?
>>
>>
>>
>> On Tue, Mar 14, 2023, 16:39 Matthew Geier mat...@...>
>> wrote:
>>
>> On 14/3/23 15:30, 'bblun...@yahoo.com' via TramsDownUnder wrote:
>>
>> I'm not conversant with the system or the failure, but if the problem is
>> in the trains' equipment, how does a hand-held radio help? Most crews
>> already have hand-held units for voice communications, which I imagine
>> would be separate from the train control system.
>>
>>
>>
>> The problem appeared to have been network wide, it is hard to believe
>> that a couple of hundred trains could fail simultaneously?
>>
>>
>>
>> The DTRS terminals in the trains were all OK, they lost the central
>> management system due to a networking fault. And for some reason the
>> fail-over system failed to fail-over.
>>
>> Presumably the branch lines that kept operating, the local SM made
>> arrangements with the train drivers to use mobile phones. I think guards
>> actually have a Sydney Trains issued mobile phones.
>>
>> As the DTRS is basically a mobile phone network (if you tell your mobile
>> phone to scan for carriers and you are near the railway you will see an
>> extra network), they could have 'failed over' to a carrier network when
>> they couldn't login to Railcorp network. Control wouldn't be able call to
>> trains, but they should have been able to 'roam' to Telstra/Optus and make
>> outgoing calls in an emergency.
>>
>>
>>
>> Seems crews are so micromanaged now that the idea of operating with out a
>> 'call all trains' and 'halt all trains' option is unthinkable.
>>
>>
>>
>>
>>
>>
>>
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>