Engineer. Urban & rail transportation - cities - applied arts & sciences - major projects - regulation - competition Tweets represent personal views only

Sydney
Joined March 2010
Road transport electrification presents a once in a century opportunity to address the user-pays element (currently petrol/ diesel tax) that contributes about half of the direct costs of road spending (including maintenance, administration, expansion, enforcement)
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Oh my god it’s real
Remember the time a transit community engagement consultant wrote an article about visiting Amsterdam to see how they built transit infrastructure and was shocked and offended that they didn’t do “community engagement”?
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David Caldwell retweeted
82 years ago today, General Douglas MacArthur “returns” to the Philippine Islands.🇺🇸
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Watching a kindergartener waddle off the train and up the subway escalators by themselves should trigger a deep sense of shame and longing in every westerner that visits.
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David Caldwell retweeted
Now that is how you drive a train. Lovely stop.
TGV Réseau 「せやな」
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David Caldwell retweeted
"This unrest is a warning sign for the entire Western world. A country that refuses to defend its borders, its history, and its culture will eventually face the progressive implosion of social trust" Not just the western world. It is to all countries. xitter.cf/FaraiMazhindu/status/2…
France will not recover; this is the end. The nation has lost the cultural war. The demographic structure has shifted forever. People who find it easy to spray graffiti on the magnificent architecture of French cities and burn Paris are the new French people. All class and decorum are gone. Arrivals from failed third-world states are not coming to assimilate or to be French; they are coming to live the third-world way. The unfolding civil unrest in France is not fundamentally about student grievances or dilapidated classrooms. The chaos is the inevitable result of an unholy, anti-white alliance that has turned parts of major French cities into dangerous enclaves where state authority has completely surrendered. The Emmanuel Macron administration has completely lost control. The political elite have spent years hiding the true demographic shifts, pretending that multicultural integration works while the traditional French way of life is hollowed out. The French state is broke and paralyzed because it has spent decades funding its own demographic replacement. The areas burning today are heavily linked to enclaves where the police rarely dare to venture, zones where Western legal norms have been replaced by radical, sectarian influences. While the mainstream media tries to fact-check the footage by calling it old or out of context, the raw video on the ground shows a society reaching a violent tipping point. This unrest is a warning sign for the entire Western world. A country that refuses to defend its borders, its history, and its culture will eventually face the progressive implosion of social trust. Once you surrender your borders and sacrifice your national identity to accommodate diasporas with totally different cultural backgrounds, you do not get a richer society; you get a war zone. France has completely failed its own people.
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Generally not well ideologically aligned with FriendlyJordies, but a great little vid on fertiliser component NPK history and issues, including some important geopolitics of which I was previously unaware (and seem to check out) youtu.be/ZJ09NvVhle4
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David Caldwell retweeted
Evil will always attack beauty first and foremost because beauty is proof of objective standards and universal truth. Dietrich von Hildebrand: “Beauty is the archenemy of mediocrity.”
This quoted post is unavailable.
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Haven’t been to the Philippines in 2 years, missing my favourite sailing conditions. But also with my more sedentary lifestyle since 3rd kid, losing the strength I need to do this stuff. Need to get back on the weights!
Glorious, but hard work in the paraw today, a struggle with the machine against the elements
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David Caldwell retweeted
Shocking story. Am glad that justice has finally prevailed xitter.cf/BillAckman/status/2111…
Five years ago, an important miscarriage of justice occurred. The story began in April 2018 when David Sabatini, an MIT, Howard Hughes Medical Institute (HHMI), and Whitehead Institute scientist and professor began a consensual intimate relationship with Dr. Kristin Knouse, a principal investigator with her own lab at the Whitehead. By January 2020, David sought to end the relationship, but Knouse apparently did not want it to end. When David thereafter started a new relationship and Knouse learned about it, she began a secretive campaign to destroy him by attempting to end his career as a scientist. She did so by damaging his name, reputation, and that of his family with false sexual harassment and other claims, thereby making him unemployable. Knouse conspired with Dr. Ruth Lehmann, the then- and still current Director (i.e., President) of the Whitehead Institute, in her efforts to destroy Sabatini. The record presented in court demonstrated that Dr. Lehmann committed to Knouse in October of 2020 that she would fire David. Dr. Lehmann made this commitment to Knouse before any investigation of the facts had taken place. Seven months after committing to fire him, in March of 2021, Dr. Lehmann, on behalf of the Whitehead, hired the law firm of Hinckley, Allen, Snyder (HAS) to undergo an investigation of David. By July 2021, HAS shared a draft of its conclusions with MIT, HHMI, and the Whitehead, but not with David or his lawyers. On the morning of August 19, 2021, David for the first time received the more than 200-page investigative report and a calendar invite for a meeting the following day with Dr. Lehmann, the president of HHMI, and the HR directors of both institutions. The report was riddled with errors and unsupported claims about David and his relationship with Knouse. When David's lawyer immediately thereafter reached out to Whitehead counsel to ask whether David was about to be fired, they confirmed that he would be terminated at the meeting. On the advice of his lawyer, David immediately resigned from HHMI and the Whitehead rather than attend the meeting. HHMI did not accept his resignation, choosing instead to fire him. MIT put David on leave and ultimately revoked his tenure. David thereafter resigned from MIT. On August 20, 2021, one day after sending David the HAS report and before David had the opportunity to dispute the facts and the conclusions of the investigation, Dr. Lehmann emailed all employees at the Whitehead informing them that David had violated a number of Whitehead policies "including policies concerning sexual harassment." The Lehmann public email, David's resignation and firing, and Dr. Lehmann's claims about David's sexual harassment exploded into a major global scandal covered in mainstream, social, and scientific media around the world as it had all of the requisite ingredients: An attractive target with David, one of the most important scientists of his generation in line for the Nobel Prize, a purported inappropriate sexual relationship with a younger female colleague, and a political and institutional environment where punishing a man for sexual harassment advanced the career and reputation of the person and/or institution that destroyed the career and reputation of the accused, regardless of the validity of the allegations. As a result of Knouse's claims, Lehmann's sham investigation, and the media onslaught that followed, David lost all sources of income and his reputation was destroyed. All prizes he had been previously been awarded were withdrawn. He was removed from all scientific advisory and other honorary roles other than as a member of our family foundation's (the Pershing Square Foundation's) scientific advisory board. When I initially learned of the news about David in the summer of 2021, I hired him as a consultant to the Pershing Square Foundation as I believed our small foundation team would benefit greatly by his insights (and he now had the time to help us), and he needed the money to support his family. At my request and under a confidentiality agreement, David provided us with many hundreds of pages of documents including texts and other communications with Knouse, the investigative report, and David's responses to the allegations so that we could do our own evaluation of Knouse's claims. I and a member of our family office's legal team carefully reviewed the documents. After a careful review of the empirical documents -- in particular the texts between Knouse and David -- it became abundantly clear that Knouse's actions were that of an angry and jilted lover, not those of a sexually harassed junior colleague. And the investigative report appeared designed to deliver a pre-ordained conclusion rather than a dispassionate fact-based analysis. The impact of the firings and the destruction of his career and reputation on David and his family was extraordinarily devastating, so much so that we became increasingly concerned that he might commit suicide. [In order to make sure that David's important scientific research would continue, in February 2023, in partnership with an anonymous donor, we funded $25 million to support David launching a new lab. As you might expect, I was reviled in the press, in scientific journals, and on social media for doing so and for supporting a so-called sex offender.] On October 20, 2021, David filed suit against Knouse alleging defamation and tortious interference in his career and his contractual arrangements. Thereafter, Knouse brought counterclaims against David. Today, nearly five years to the date of the filing of the suit, he has finally received justice. Today, a 13-person jury (seven men and six women) of David Sabatini's peers (12 jurors plus an alternate) unanimously determined that David proved that Kristin Knouse defamed him, tortiously interfered with his contractual relationships (his entire career as a scientist), and tortiously interfered with his prospective advantageous relationships (his future employment). The jury awarded him nearly $10 million in damages including interest. The jury rejected all of Knouse's claims including her claims that David engaged in quid pro quo sexual harassment and created a sexually hostile work environment. While five years is a very long time to live under a reputational cloud, justice was finally served today for David, but not completely in my view. To this day, Dr. Ruth Lehmann remains Director of the Whitehead Institute. Dr. Lehmann worked alongside Dr. Knouse to destroy David Sabatini, an acclaimed scientist and professor. She did not follow due process before she intentionally destroyed David's career and reputation. Dr. Lehmann nearly killed David with her actions, as had we not rescued David by finding him employment, supporting him publicly to buffer the reputational damage, and supporting his recovery, he could have ended his life and left his son without a father before the world understood what had transpired here. And the reputational damage was not just to David. David's brother, Bernardo Sabatini, is one of the most important neuroscientists in the world. To this day, he has had to deal with a large cloud over his family name and reputation. Recently, when the new CEO of our brain institute mentioned that Bernardo Sabatini was on our board, he was asked: "Wasn't he involved in some kind of sex scandal?" For obvious reasons, the character of the person who runs a scientific institute is of utmost importance. Among other failures here, Dr. Ruth Lehmann committed to Knouse that she would fire David many months before an investigation was even launched and without consideration of the empirical facts. How can one trust research produced by a scientific institute if its leader is not committed to observing the empirical facts before reaching conclusions that have life-threatening import? We have unfortunately seen massive amounts of scientific fraud which has harmed innumerable human lives and wasted billions of dollars of research funding and time. For her ethical breaches here, Dr. Lehmann should be fired from the Whitehead. Based on her actions in this case, she is in no position to serve as the leader of an important scientific institute. I speak with some perspective on how scientific and other institutions should be led. Including the recent launch of the Ackman Oxman Institute, we have funded approximately $1 billion of scientific research and institutions over the last decade or so, and this experience has given us the opportunity to meet the leadership of many of the most important scientific institutions in the world. To put it plainly, we would not give a dollar to a scientific institute whose leader compromised basic moral principles as has happened here. At an absolute minimum, the board of the Whitehead should immediately launch a detailed and independent investigation of Dr. Lehmann's actions in the Sabatini case. I would encourage the investigation, among other considerations, to carefully exam all of the correspondence between Lehmann and Knouse, as well their correspondence with the HAS law firm on among other areas, the various drafts of the Sabatini investigative report. Alternatively, Dr. Lehmann could resign, minimize further distraction for the Whitehead, and save institutional time and resources that would be better spent on research that benefits humanity.
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David Caldwell retweeted
Dites-vous que les automobilistes qui n'arrivent pas à estimer le gabarit de leur voiture en franchissant ces barrières, sont les mêmes qui nous disent parfaitement maîtriser leur gabarit quand il s'agit de frôler les cyclistes en les doublant à qqes centimètres #ViolenceRoutière
🐫 Forget speed bumps. 📸 Forget speed camera's. 🚫 Forget road signs. Car drivers fear nothing more than a scratch on their paint. And overestimate the size or their car (amongst other things). Crucial knowledge if you want to lower speeds. (🎞️ by David Ho)
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David Caldwell retweeted
This guy should be in prison. He single-handedly faked data in at least two high-impact papers. Instead, he got to enjoy the generous salary of a Schmidt Science Fellow, has received zero punishment, and has now simply moved on to pastures anew (writing about classical music). Retraction note for his 2022 Science Translational Medicine paper: science.org/doi/10.1126/scit… Retraction note for his 2023 Nature paper: nature.com/articles/s41586-0… Nature paper he was a middle author on with an editor's note due to possible data fabrication: nature.com/articles/s41586-0… and associated PubPeer: pubpeer.com/publications/292… And no, prison is not too harsh. He's threatened the careers of every other scientist on his papers, stained the institutes he was at & journals he's published in, and has added to growing distrust in science. He's also likely sent many other scientists down unproductive rabbit holes because they believed his fake data were real. All of this also means ~millions of wasted dollars on fake science or science misled by fake science. Lack of punishment = incentive. We need to seriously crack down on proven fraudsters. Prison is entirely appropriate imo.
Science Translational Medicine has retracted a paper on COVID-19 vaccines after an institutional investigation revealed a former Ph.D. student fabricated data. Ng wrote an article on Giacomo Puccini’s opera “Turandot” for @nytimes earlier this year. retractionwatch.com/2026/10/…
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I met someone quite senior in the rail industry yesterday who thought the “trolley problem” was just a social sciences/ philosophical thought experiment, not a real thing that railways are actually full of. Most obviously, catch points, trap points or derails,
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I think the iMHO quite extraordinary ignorance of how things work is also evidenced in organisational messaging/ press statements in cases where the mitigation (the trolley problem) has been put in effect, egs in Sydney, Clarendon 2025, Mulgrave c2015, Unanderra c2010
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At least one of these caused injuries, but all IIRC were described as derailments as of the system had an uncontrolled failure, when in fact the derailment was the active control of the failure
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David Caldwell retweeted
I’m in Switzerland with Nexus – Tyne and Wear Metro, looking at cost-effective electrification renewals. Much of what makes this work efficient is what the UK sector has been calling for for a long time; it has just been put into practice. A few lessons (1/7) 🧵
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David Caldwell retweeted
Ooof! Electricity price on Amber is $26 kWh in Sydney We often see people proudly posting when it’s near free at midday, but there’s two sides to it, you need to know what you’re doing I’m currently being paid $24/kWh to export, such a mess, can we just get back to boring reliable cheap abundant energy?
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I had a cab driver in Brisbane yesterday with whom, after he misidentified an HD Holden ute as an EH, I had a discussion about the differences between them EJ, EH and HD. Was as good as a holiday to the past. I doubt a single cab driver in Sydney would know what an EH is
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David Caldwell retweeted
Propaganda aside, it's worth thinking through carefully what this ad is really saying.🧵 If Australia cut low-skilled migration, would grocery shelves be empty, bars have no staff, and the elderly rot away unattended in nursing homes, like the ad wants you to think? (1/n)
Queensland Hotel Association just posted this on their Instagram…
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