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Not being a Sydney-slicker any more ... is there a cross-over at Town Hall on the wired section which would allow non-battery trams to operate beyond Chalmers Street down the Town Hall?
Yes. Scissors crossover at Bathurst Street. But they have been lazy scheduling.
The trams in service with disabled batteries have been terminating at the 'back platform' at Central Chalmers then waiting there for the amount of time it would have taken them to go to Circular Quay from Central and return. They then depart into their timetabled slot as if they were running normally.
If they ran to Town Hall, one they would have to do a very quick change ends (or use the 'stepping back' technique) , they would have to immediately depart Town Hall to avoid blocking the line, they couldn't wait at Town Hall for time it would have taken them to run to Circular Quay and return, so all the vehicle and crew diagrams would have to be rejigged to account for the Town Hall short working.
They do have a template for turning BACK all services at Town Hall, but turning back just two sets out of however many are normally on the road would make for an 'interesting' exercise is diagramming.
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On 18 Mar 2026, at 09:30, 'hun...@optusnet.com.au' via TramsDownUnder <tramsdo...@googlegroups.com> wrote:
I gather they are not allowed to tow/push cars in passenger service. At any rate the driver can't just tow a dead car, the seals on mode switches have to be broken and tow mode selected on the main computer.
Doing any of that requires explicit permission from the OCC.
Not as if the driver could push the lead car off a dead APS segment and just have the rear (still powered car) push them forward by simply 'notching up' on the lead car.
Nothing a software update couldn't fix, but that would require accepting that your drivers could show good judgement and initiative. Such qualities appear to be frowned on by modern management.
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No - only batteries found to be at fault are disconnected. But they are so short of serviceable cars, they have to use these cars in service if the only fault is a dud battery pack. The majority of the fleet you see 'on the road' has active traction batteries.
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They would have to shunt at Goulburn Street crossover. I don't think such a move is permitted by the signalling system.
Note the traction batteries can run the tram for only a 100m or so. They are sized to get the trams off dead APS segments or at a pinch, to the next platform in the event of traction power failure. They are not sized to run any significant distance.
On 18 Mar 2026, at 11:53, 'Matthew Geier' via TramsDownUnder <tramsdo...@googlegroups.com> wrote:
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The batteries don't have that sort of capacity nor are they designed to provide continuing battery operation in regular service.
They were intended to be a "Safety feature" providing the tram with emergency power should the overhead and/or the APS power supply fail so that the tram could 'limp' to the next stop so that passengers could be "safely disembarked". As far as I am aware the operating procedures do not provide for passengers to be disembarked between stops, hence the practice of locking in passengers. on failed trams.
The APS supply is continuing to experience regular failures of sections in the ground supply distribution system. In order to access and repair these sections safely the operation requires tram services across these sections to be shut down. There are also problems caused by delays to replacements being received from overseas manufacturers.
In an attempt to avoid these shutdowns (lots of section failures) Transdev have set up the trams to automatically continue over failed sections operating off the emergency standby battery. Over time the standby batteries fail or catch fire due to overload and/or excessive use.
Modern light rail systems in Dublin and Edinburgh which were constructed in the same era as the CSELR investigated the APS system and rightly rejected the APS as too expensive, too unreliable and providing an unacceptable adverse operational impact on tramway operations. They found APS to be an Awfully Pricey System.
Reinstallation of the overhead supply system which the NSW tramways operated along George Street between Town Hall and Circular Quay for more than sixty years is the obvious solution.
Greg
APS goes all the way to Circular Quay. I don't know whether the batteries have the capacity to power a tram all the way from Town Hall to Circular Quay and back. There is no provision for overhead battery top-up at the Quay, b when the tram mwaysfails to proceed.ut I don't know whether the Alstom batteries can be in-motion charged.
In the absence of a turning loop, a third track/platform was built at the Quay to provide terminus capacity for 2 minute headways. This track should never, ever see a tram in it under four minute headways, but I gather from anecdotes that the operation gets out of sorts sufficiently for trams to be seen in this third platform from time to time. I can't imagine how the present operators would sections continue to fail in service. This means a operational shut down to enable safe access for maintenance personnelmanage 2 minute headways to the Quay if called upon, but that's the long term plan as the city and patronage grows further. Like the metro, the system is designed to deliver vastly more capacity for future growth than is required at present, but it needs to run like a Swiss watch (i.e. a good European system) to accomplish that. The operation, the power system and the trams all need to be top notch for that goal. At present they're not.
Tony P
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No - only batteries found to be at fault are disconnected. But they are so short of serviceable cars, they have to use these cars in service if the only fault is a dud battery pack. The majority of the fleet you see 'on the road' has active traction batteries.
Hmmm you would have to deal with her rose coloured glasses firstJ
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