Re: L2 Randwick and L3 Kingsford light rail improvement works
  Mark Skinner

The gauge will be eased over time by trams wearing out checks and rails.

(Yes, I am being sarcastic, in case anyone was wondering).

On Mon, 2 Aug 2021, 4:23 pm Greg Sutherland, gregsutherland@...>

> It is not as though the problem of getting fixed truck trams around tight

> curves hasn't been dealt with in the past nor have solutions adopted by

> highly experienced and capable engineers not been recorded by Technical

> Journals.


> NSW Tramways had a long history of operating 4 wheel trams (C, D, E,J, and

> K classes) between the 1890s and the 1950s with a number of 4 wheel service

> trams enduring until the final system shutdown. For many years these trams

> operated, often as coupled sets, on the tightly curved and steep Bondi via

> Belluevue, Watsons Bay (for 30+ years an exclusively 4 wheel tram service)

> and North Sydney lines.


> Other Australian systems also had many examples of 4 wheel trams.


> The attached page 424 "Bradfield on Electric Tramways"extract from


> *Electric tramway : The Spit to Manly, N.S.W. / by John Job Crew Bradfield*





> shows the 'easing of gauge' adopted for decreasing radii of curves and

> also for different rail cross sections adopted as system standards. Most

> outdated of course as it had nothing to do with real (heavy) railways!


> Regarding the "institutionalised extablishment" I recall attending a

> presentation by a leading practitioner of this group as he expounded on

> CSELR light rail track. When questions from the floor were invited I asked

> if any consideration had been given to easing the gauge. He first appeared

> non plused, then followed the "Pesant, I am the expert consultant, put down.


> Unfortunately one of attendees in the audience piped up "I work for XYZ

> concrete sleeper manufacturers and we have made easing sleepers to special

> order for Melbourne", the Chair of the meeting immediately called for the

> next presenter to present a paper on a different subject!


> One could also note that after their sterling work on the CSELR

> WSP/Parsons Brinckerhoff were commissioned by TfNSW to undertake similar

> work on the Parramatta Light Rail.


> Greg



> On 2/08/2021 2:42 pm, TP wrote:


> (snip)


> As far as I know, there is no curve on CSELR less than 25 metre radius

> which is the generally accepted minimum for a tram with fixed trucks,

> though it by no means immunises the system and its trams from damage,

> especially when there are quite a few curves and many trams, as on CSELR.

> Many of these modern light rail systems are basically long runs of straight

> lines (typical grid city layout, which Sydney isn't), with the occasional

> turn to navigate. A fixed truck tram is simply unsuitable for a line

> profile that has frequent curves. New systems like Adelaide, Gold Coast and

> Canberra are examples of systems with long straight runs and only a rare

> corner or curve, so they get by with the fixed truck trams. None of

> Sydney's three systems has significant straight runs.


> (snip)


> So many mistakes and with little prospect of being rectified, as I see

> that the new light rail mob with their heavy rail background have become

> the institutionalised establishment , complete with their own

> prefessionally internalised annual conferences where they can share their

> lack of knowledge with each other, unchallenged by those "outdated" folk

> from legacy systems. Though, it is true that Melbourne professionals do get

> along to these talkfests but, if they proffer any educational role, it

> doesn't seem to have any effect. I wrote a letter to TAUT about all this

> recently. Time to lift the game and not rest on laurels.


> Attachment


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