Peak hour chaos on regional train network as trains delayed for hours

 

News article: Peak hour chaos on regional train network as trains delayed for hours

Melbourne’s train network is set to return to normal after heavy delays which stranded regional and metropolitan travellers for hours tonight.

  x31 Chief Commissioner

Location: gallifrey
Time to cut again through the bull.  This service outage was caused by the axle counters failing on the skyrail section. When the signalling for skyrail was designed planners wanted to use track circuits but MTM wanted axle counters.  The risks of implementing this way was highlighted to MTM management as risk meetings and was ignored.

When the axle counters cannot continue to communicate with each other they shutdown halting the network.  As they are located on the skyrail sections it is not possible to now drive up and fix the issue.  You need to now get total occupancy of the track due to the lack of clearances on the structure.

This takes hours and also each counter had to be manually reset and a test train sent down the track followed by another shortly thereafter to reset and confirm all working.

It is possible by manufacturer design to reset the counters remotely but this as never implemented.


The sell on the axle counter solution was 1 in 1 million fault tolerances which of course was bull.  MTM screws us again.

Peak hour chaos on regional train network as trains delayed for hours

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  YM-Mundrabilla Minister for Railways

Location: Mundrabilla but I'd rather be in Narvik
'We are investigating the route cause'

Whilst searching the Skyrail route they may even find the root cause of the axle counter problem!

Sorry it's only the Herald-Sun after all.
  x31 Chief Commissioner

Location: gallifrey
Did you guys know when a project is handed to MTM for delivery, MTM take their profit off the top straight way leaving an amount left to complete the work.  This work often runs over and the scope is therefore cut back.  This is one reason why so many projects are poorly implemented by MTM.

When the project runs over the money does not come back from Hong Kong.
  kitchgp Assistant Commissioner

Is that why the signals are Homes, and not Automatics?
  jakar Assistant Commissioner

Location: Melbourne
Is that why the signals are Homes, and not Automatics?
kitchgp
The type of detection system used (axle counters vs track circuits) has no bearing on the type of signal, Automatics work fine elsewhere with axle counters.
  kitchgp Assistant Commissioner

Is that why the signals are Homes, and not Automatics?
The type of detection system used (axle counters vs track circuits) has no bearing on the type of signal, Automatics work fine elsewhere with axle counters.
jakar

Thanks. Why are does Skyrail have Home signals on sections of track that could be protected by Automatics?
  KRviator Moderator

Location: Up the front
Because you can trip past an Auto without contacting anyone. A Home signal requires you to contact the signaller for authority, and protects an identified risk - points, shunting movements, etc.
  YM-Mundrabilla Minister for Railways

Location: Mundrabilla but I'd rather be in Narvik
Because you can trip past an Auto without contacting anyone. A Home signal requires you to contact the signaller for authority, and protects an identified risk - points, shunting movements, etc.
KRviator
Of which in many locations there are none. Of course you must have home signals in some locations but in this case I assume, like the underground, that there are additional perceived risks.
  jakar Assistant Commissioner

Location: Melbourne
Is that why the signals are Homes, and not Automatics?
The type of detection system used (axle counters vs track circuits) has no bearing on the type of signal, Automatics work fine elsewhere with axle counters.

Thanks. Why are does Skyrail have Home signals on sections of track that could be protected by Automatics?
kitchgp
I'm sure there is an official reason somewhere but AFAIK its due to risk mitigation. They don't want any incidents up there so they'd rather a signaler be in charge when things go south instead of drivers authorizing themselves passed auto's. The downside to this is that it takes a lot longer for trains to clear a section, particularly when a large portion goes down as occurred recently.

In Vic drivers are required to call a number before proceeding past an auto, although this takes time it is still quicker than getting verbal authority from the signaler who is no doubt tying to process other trains if the system has gone down. As YM points out, most of it could be auto's as there is nothing to protect but the people in charge have gone down the uncontrolled Home signal path.

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