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OpenCiv3: Open-source, cross-platform reimagining of Civilization III

https://openciv3.org/
377•klaussilveira•4h ago•81 comments

The Waymo World Model

https://waymo.com/blog/2026/02/the-waymo-world-model-a-new-frontier-for-autonomous-driving-simula...
741•xnx•10h ago•455 comments

Monty: A minimal, secure Python interpreter written in Rust for use by AI

https://github.com/pydantic/monty
111•dmpetrov•5h ago•49 comments

Show HN: Look Ma, No Linux: Shell, App Installer, Vi, Cc on ESP32-S3 / BreezyBox

https://github.com/valdanylchuk/breezydemo
132•isitcontent•5h ago•13 comments

Show HN: I spent 4 years building a UI design tool with only the features I use

https://vecti.com
234•vecti•7h ago•112 comments

Dark Alley Mathematics

https://blog.szczepan.org/blog/three-points/
21•quibono•4d ago•0 comments

Microsoft open-sources LiteBox, a security-focused library OS

https://github.com/microsoft/litebox
302•aktau•11h ago•150 comments

Sheldon Brown's Bicycle Technical Info

https://www.sheldonbrown.com/
302•ostacke•10h ago•80 comments

Show HN: If you lose your memory, how to regain access to your computer?

https://eljojo.github.io/rememory/
156•eljojo•7h ago•117 comments

Hackers (1995) Animated Experience

https://hackers-1995.vercel.app/
375•todsacerdoti•12h ago•214 comments

An Update on Heroku

https://www.heroku.com/blog/an-update-on-heroku/
300•lstoll•11h ago•227 comments

Show HN: R3forth, a ColorForth-inspired language with a tiny VM

https://github.com/phreda4/r3
42•phreda4•4h ago•7 comments

I spent 5 years in DevOps – Solutions engineering gave me what I was missing

https://infisical.com/blog/devops-to-solutions-engineering
100•vmatsiiako•9h ago•32 comments

A century of hair samples proves leaded gas ban worked

https://arstechnica.com/science/2026/02/a-century-of-hair-samples-proves-leaded-gas-ban-worked/
50•jnord•3d ago•3 comments

How to effectively write quality code with AI

https://heidenstedt.org/posts/2026/how-to-effectively-write-quality-code-with-ai/
165•i5heu•7h ago•122 comments

Learning from context is harder than we thought

https://hy.tencent.com/research/100025?langVersion=en
136•limoce•3d ago•75 comments

FORTH? Really!?

https://rescrv.net/w/2026/02/06/associative
35•rescrv•12h ago•17 comments

Understanding Neural Network, Visually

https://visualrambling.space/neural-network/
223•surprisetalk•3d ago•29 comments

I now assume that all ads on Apple news are scams

https://kirkville.com/i-now-assume-that-all-ads-on-apple-news-are-scams/
951•cdrnsf•14h ago•411 comments

PC Floppy Copy Protection: Vault Prolok

https://martypc.blogspot.com/2024/09/pc-floppy-copy-protection-vault-prolok.html
7•kmm•4d ago•0 comments

Introducing the Developer Knowledge API and MCP Server

https://developers.googleblog.com/introducing-the-developer-knowledge-api-and-mcp-server/
7•gfortaine•2h ago•0 comments

I'm going to cure my girlfriend's brain tumor

https://andrewjrod.substack.com/p/im-going-to-cure-my-girlfriends-brain
28•ray__•1h ago•4 comments

The Oklahoma Architect Who Turned Kitsch into Art

https://www.bloomberg.com/news/features/2026-01-31/oklahoma-architect-bruce-goff-s-wild-home-desi...
17•MarlonPro•3d ago•2 comments

Show HN: Smooth CLI – Token-efficient browser for AI agents

https://docs.smooth.sh/cli/overview
76•antves•1d ago•56 comments

Claude Composer

https://www.josh.ing/blog/claude-composer
94•coloneltcb•2d ago•67 comments

Evaluating and mitigating the growing risk of LLM-discovered 0-days

https://red.anthropic.com/2026/zero-days/
31•lebovic•1d ago•11 comments

Show HN: Slack CLI for Agents

https://github.com/stablyai/agent-slack
36•nwparker•1d ago•7 comments

How virtual textures work

https://www.shlom.dev/articles/how-virtual-textures-really-work/
22•betamark•12h ago•22 comments

Masked namespace vulnerability in Temporal

https://depthfirst.com/post/the-masked-namespace-vulnerability-in-temporal-cve-2025-14986
31•bmit•6h ago•3 comments

Evolution of car door handles over the decades

https://newatlas.com/automotive/evolution-car-door-handle/
38•andsoitis•3d ago•61 comments
Open in hackernews

Boston's subway system replacing 1890s-era wooden catenary system

https://www.mbta.com/news/2025-11-18/mbta-announces-december-service-changes
47•ilamont•2mo ago

Comments

vjulian•2mo ago
If only they’d make the T fare free and run more frequently and later into the night. The C line in Brookline has the potential to be extremely convenient, but at present most of the time it’s easier to take an Uber, or drive.
tapoxi•2mo ago
It's what, $2.40? I don't think they need to make it fare free.
vjulian•2mo ago
Free fares would significantly increase ridership, no?
chollida1•2mo ago
Yes, and reduce its revenue that it needs to properly run and upgrade its existing infrastructure.

Why do you think they charge in the first palce?

venturecruelty•2mo ago
Because governments aren't allowed to simply provide services for free anymore. It is inconceivable that something like moving around on mass transit would be free at point of use.
anthonypasq•2mo ago
brother the MBTA arleady bleeds money at an astounding rate despite a large budget and fairs.

Why would your solution to be to make the rest of the state pay more for services they cant even use rather than make the people that use it pay the true cost it take to run it?

People that drive cars actually pay most of the cost to upkeep car infrastructure. people that ride the T dont.

venturecruelty•2mo ago
Call me crazy, but maybe mass transit doesn't need to make money to be useful. Maybe the entire point of government is to provide services to its citizens. I mean, I don't pay $2.40 every time we drone strike some Yemeni wedding, right? Why should I have to pay to take a train in a city, which is about a thousand times more useful to me?

>People that drive cars actually pay most of the cost to upkeep car infrastructure. people that ride the T dont.

This is... so ridiculously untrue. Most car-dependent infrastructure is funded with federal dollars, the vast majority of which are conjured up out of thin air and vibes.

anthonypasq•2mo ago
> Call me crazy, but maybe mass transit doesn't need to make money to be useful.

This is such a heinous non-sequiter i dont even know where to begin. Government services take money to operate. Government services are paid by taxes. In a democracy, you need to make people agree that they want to pay taxes for particular services.

The 60% of massachusetts residents who dont live in teh greater boston metro area do not want to pay for a service they dont use, so it is nearly politically impossible to raise the budget of the MBTA.

So if you are a massachusetts state legistlator you have a couple options. you can allow the MBTA to continue to deteriorate while also going over budget every year (current state) or you could increase the fare to compensate for the actual cost it takes to run the service, or your third option, which is to decrease the amount of money that goes to an already deteriorating public service.

edit: 50-55% of car related infrastructure costs are paid by gas taxes, tolls, excise taxes etc. currently <30% of the mbtas budget is covered by fares.

Arainach•2mo ago
Services have costs. They don't lose money. No one says the US military "loses hundreds of billions of dollars a year" or expects them to cover it back.
anthonypasq•2mo ago
??? did you actively not read my comment before posting this?
SoftTalker•2mo ago
You can say the same thing about most federal spending.

Car and truck owners pay fuel tax and registration tax (hundreds or thousands of dollars a year, especially heavy trucks) which all ostensibly goes to road upkeep and related infrastructure. It may not cover all the costs but neither do transit fares.

I don't know anything about Boston's system but most transit agencies would need to have fares in the tens of dollars per ride, at least, to come anywhere close to covering their costs. This is much closer to the costs of using a car, probably not coincidentally. Getting from point A to point B has a value that is independent of the transport mechanism.

pugworthy•2mo ago
Rider fair is only one way to fund transit. My city (Corvallis, OR) provides free bus service city wide since 2011. The newest addition is free bus service to surrounding cities (up to McMinville and down to Eugene).

It's paid for with state and federal grants, university (OSU) contribution, as well as a utility fee.

bluGill•2mo ago
Probably not. For most people cost is not the issue of why they don't ride. Free would increase a little, but most people are not riding because the service isn't there. Service can be one of Frequency, speed, or ability to get to the destination.

Transit needs to: Get you from where you are, to where you want to be, when you want to go, in a reasonable amount of time, for a reasonable cost. If you lack any of those things and transit isn't useful. Generally cost is the only part of transit that is reasonable (but not always) and so it isn't something to focus on.

People who ask for free transit are really saying transit is for the poor and "normal people" should just drive.

bombcar•2mo ago
Worse, free fares can cause undesirables to cluster and abuse the system.

Transit begin able to be paid with a phone has removed most or all the "friction" arguments, the need is to make it reliable (arrive on time) and frequent (so you don't have to meticulously plan your day).

AnthonyMouse•2mo ago
> Transit begin able to be paid with a phone has removed most or all the "friction" arguments

That's the sort of thing that would get many people to avoid using it because of the growing (and accurate) sentiment that anything that requires you to use your phone is using it as a tracking device.

potato3732842•2mo ago
You're not wrong. But the MBTA went to phones because an insane fraction of the cash they handle "goes missing".
AnthonyMouse•2mo ago
Another problem solved by setting fares to zero.
bluGill•2mo ago
Transit should accept lots of options. Your credit card, a phone, or a pass. Modern e-readers can read all of the above and are very cheap so there is no reason to refuse any (unless they charge too high of a fee)

If you want to remove friction set a way such that a family has a maximum monthly charge they will pay. It does mean you need to track people, but if you a careful in how this is done it is worth it since cost for frequent travelers could be an objection and you want this peace of mind that your max cost is known.

bombcar•2mo ago
A familial "maximum charge" would be so nice, simplifying things and meaning you don't have to worry about it.

The only time you should really be worried about limiting rides on transit is if the system is already overburdened (perhaps as the proverbial Japanese trains with shovers).

AnthonyMouse•2mo ago
> Modern e-readers can read all of the above and are very cheap so there is no reason to refuse any (unless they charge too high of a fee)

Nearly all of them will have some recurring service fees and paying ~3% to process credit card payments is fairly unavoidable, but those aren't even the biggest costs. You have to install card readers everywhere, which is not just the equipment cost but also the labor to install them, and maintain them, and keep them networked with all the costs of that. If any of it fails it's a service interruption which means you need redundancy and overnight support. People call you with billing problems or commit fraud and have to be investigated.

What's the point of any of that when the fares are generating less than 1% of the state budget, have privacy issues and deter people from doing something you want to encourage?

pugworthy•2mo ago
Speaking generally, free fairs also provide various benefits to a community such as reduced use of cars and easier access for lower income access to jobs and services.
anthonypasq•2mo ago
you probably dont live in Boston, because there is no one on the planet that drives into boston rather than taking the T because its too expensive. people drive downtown and pay $40 for parking instead of taking the T.
AnthonyMouse•2mo ago
That's assuming there is nothing else on the ledger.

Suppose you have to choose between a suburban house without any convenient access to mass transit (i.e. you're going to have to drive everywhere) or a more expensive unit which is closer to the city and is near a transit stop. Paying $40 for parking is going to offset the cost advantage of the less expensive housing and leave a lot of people near the breakeven point, and then a $100/mo difference in transit fares could be the deciding factor.

anthonypasq•2mo ago
theres plenty of essentially free park and ride stations. theres commuter rail access in basically a 1 hour drive radius of the city. nothing about what you said is relevant.

rich people (of which boston has plenty even in the burbs where average house prices are 800k+) pay to avoid existing near poor people. they think they are going to get stabbed on the subway.

if the subway was faster, safer, cleaner, but more expensive, more people would use it.

potato3732842•2mo ago
There is nothing convenient about doing park and ride. It's something you do because whatever your other options are suck worse. Commuter rail inevitably dumps you somewhere you don't need to be so then you have to take the T from there. There is no way not to make it a slog of a commute with that many transitions.
AnthonyMouse•2mo ago
> theres plenty of essentially free park and ride stations.

Which is a huge pain, because now you need to have a car, and already be in it to drive to the park and ride. A drive on which there could be traffic. Which means you could miss your train unless you leave early, but then you're standing around the train station doing nothing (and not getting paid) even when there isn't traffic, instead of spending that time either at home or at work. Whereas if you lived near the train stop you wouldn't have to leave early to not miss your train.

Meanwhile if you already need to have a car, and you're already in it and driving it, most people aren't going to drive northeast to the park and ride and then take a train southeast to their destination instead of saving time by just driving directly east all the way to the destination. So the thing that gets them on the train is not having to drive to get to it.

> theres commuter rail access in basically a 1 hour drive radius of the city.

There's commuter rail lines that go an hour from the center of the city. That's not at all the same thing as there being a stop within walking distance of every suburban home.

> they think they are going to get stabbed on the subway.

The people who think they're going to get stabbed on the subway are not going to use the subway. We're talking about the people who might actually use it.

> if the subway was faster, safer, cleaner, but more expensive, more people would use it.

The way you make it faster is to get more people to use it so you can justify more frequent service, which eliminating fares facilitates. The way to make it safer and cleaner is to get more people to use it, so there are more people who care if it's safer and cleaner because they're using it. Which is again facilitated by eliminating fares.

The only thing fares get you is an amount of money that represents less than 1% of the state budget, and then you lose a significant proportion of that to the cost of collecting the fares. It's taking a privacy-invasive deadweight loss to create a deterrent to something you're trying to encourage people to do.

AnthonyMouse•2mo ago
> Free fares would significantly increase ridership, no?

It's not just about that. Higher transportation costs are heavily regressive. People with less money can't afford to live in the city and have to commute and then anything they pay to commute is independent of their wages, so $100 in fares is $100 whether you make $200k/year or $20k, whereas even the taxes like sales tax labeled as "regressive" would have the former person paying ten times more than the latter.

Moreover, fares are often heavily subsidized to begin with -- in large part because of the above -- but then not zeroing them out requires you to still pay the full cost of the collections infrastructure. Which is actually really expensive, because then you need turnstiles, payment processing equipment, security to prevent theft or card skimming, billing departments to deal with credit card fraud or chargebacks, customer service when people have problems, enforcement against people who skip the fare, etc. None of those costs go away if the fare is even $0.01, but they all disappear when it's actually zero.

And people who have never used it before then wouldn't have to figure out how to set it up, which is a significant source of friction independent of the fare and can cause people to just get an Uber (which they've already set up) or rent a car etc. Which causes people to never even try using mass transit, and then regard it as that thing they never use so why is the government spending money on it, instead of that thing that was convenient to use when their car was in the shop and made them realize that they can get by as a one-car household instead of two, or at least something worth supporting because they remember actually using it.

On top of that, removing the fares is better for privacy because then you're not tying your movement history to your payment card.

anthonypasq•2mo ago
the MBTA already absolutely bleeds an incredible amount of money. No businesses in Boston are even open late, theres no night life. 90% of the young people in the city are nerds doing Phds.

I loved living right on the red line, but its just not worth it unless we figure out how to make it not cost a fortune.

fragmede•2mo ago
Why does it have to make money? We don't ever expect the welfare department to suddenly turn a profit, do we?
mindslight•2mo ago
I haven't been there in a while. Is one of the four bars in Brookline now open past 8PM or something?
paleotrope•2mo ago
There are a few, but they are trying to fix that since no one stays up that late.
vjulian•2mo ago
The Abbey is often buzzing until 2am. Food served after midnight, too.
ttd•2mo ago
It's been a decade+ since I used to catch the Green line at Park St, but at that time it was the noisiest, squealiest station that I regularly used. Not surprising to learn that parts of that station are left over from the 1890s.
beastman82•2mo ago
It's deafening
drob518•2mo ago
The builders should be patting themselves on the back. The fact that some of this infrastructure was built in the 1890s is amazing.
teruakohatu•2mo ago
> dates back to the late 1890s and will be replaced with a modern, more durable, metal trough.

I think any infrastructure that has lasted over 130 years is already quite durable.

phailhaus•2mo ago
It's probably not the same wood since 1890. Requires more repairs and replacements.
SoftTalker•2mo ago
I think there's a good chance it is. Not out in the sun, not in contact with ground/moisture, pretty consistent temperature. Wood can last a very long time under those conditions.
bluGill•2mo ago
It could be. A lot of wood has been around for longer than that. Wood is easier to damage so I expect some has been replaced over the years, but there is no reason to think it wouldn't last in that application.
jeffwask•2mo ago
Yeah, I watch mine exploration videos and it's shocking how well wood in a dry and stable environment will last.
paleotrope•2mo ago
I wouldn't exactly call the environment on the green line as dry, especially in the summers.
Perz1val•2mo ago
Maybe the chemicals they've used to treat the wood were so hardcore
IAmBroom•2mo ago
The city of Venice is literally built upon timbers driven into the seafloor.

That haven't ever been replaced.

supportengineer•2mo ago
Once again, promo-driven culture rears its ugly head.
paleotrope•2mo ago
It's wood, I'm sure the MBTA has a workshop that can build replacement parts.

Odds are the replacement is going to be some custom metal machined overseas and will be basically irreplaceable due to cost and skill issues.

clickety_clack•2mo ago
And being the MBTA, it will be installed in the wrong size and have to be replaced in a couple of months.
hopelite•2mo ago
My bet is on that there will be some kind of interaction of the metal catenary in the environment and maybe causing friction in the cables and shorts, which no one thought of since 1890 when they chose wood due for its insulating properties.

Then they will have to replace the metal with some fancy plastic one, because you can’t just admit the wood was better after all, but the plastic will also be unsuitable and degrade quickly which will ultimately end up with going back to wood in another 10 years. But that wood will then only last a fraction of the original wood, because we do not have old growth wood anymore and all the pine plantation wood won’t last a similar 130+ years.

So after about $3 billion dollars in costs and another $5 billion in economic and lifestyle impact after 20 years, they’ll declare it all a wonderful success, even though the wooden catenaries will live on as art or interior decor for another 200 years.

If we’re lucky, the death toll will even be low.

potato3732842•2mo ago
I foresee a "oh we can't replace the plastic one it with wood now because that would be a new material and we don't have data to prove it conforms with some rule we made up so the only solution is to pay some engineering firm who knows people on beacon hill a ton of money to say that pine is fine" situation before they go back to wood.

And as bad as the MBTA is... Keolis is worse (arguably).

wffurr•2mo ago
The MBTA has a quite capable metal shop that's been making replacement parts for the 1960s vintage subway cars for quite a while.
paleotrope•2mo ago
Right but it will be something they can't work with. Like some custom magnesium-aluminum metal that has to be cast and can't be machined with normal tools.
IAmBroom•2mo ago
Har, har, har, Buy Murican, amirite?
bloppe•2mo ago
I encourage anybody who gets the opportunity to ride the green line. It's cool that they managed to build it in a time before tunnel boring machines (by literally digging a huge, long pit, building the track, then covering it with a roof and dirt again). Just wear noise cancelling headphones or something cuz those trains screech
laurencerowe•2mo ago
Cut and cover is still the cheapest way to build subways, but is less often used nowadays because of the surface disruption.

Long before tunnel boring machines existed we needed to develop methods to dig under rivers. Brunel invented the tunnelling shield for digging under the Thames in 1825 and later a more refined version was used to dig the first deep-level tube line which opened in 1890.

https://en.wikipedia.org/wiki/Tunnelling_shield

IAmBroom•2mo ago
THIS kind of comment is what makes HN gold!

TIL...

mikestew•2mo ago
The part relevant to the editorialized headline:

“The MBTA will perform work in December to replace the wooden overhead catenary wire “trough” in the Green Line tunnel, which is original to the tunnel’s construction in the late 1890s. The trough houses the Green Line’s overhead wires and will be replaced with a modern, more durable, metal trough.”

jeffbee•2mo ago
Boston subway to replace cable duct that worked for 130+ years
jpmattia•2mo ago
Hold a chain at its ends, and let it hang down naturally. What is that shape called? A catenary and its equation is y = a cosh(x/a).

Maybe you all knew that factoid already, but I learned the name of shape only recently.

vasco•2mo ago
And efficiency of the line depends on the curvature so for a given target efficiency you can calculate how far apart the poles can be. For electrical lines I mean.
staplung•2mo ago
I actually did already know that factoid but was struggling (am still) to see how it relates to a wooden trough that merely holds cables.

Another interesting factoid about the catenary: Robert Hooke proved that it takes on the shape (though inverted) of the ideal arch, in terms of supporting loads above it. La Sagrada Familia in Barcelona is filled with them.

ninju•2mo ago
The Gateway Arch is an inverted catenary structure

https://www.nps.gov/jeff/planyourvisit/materials-and-techniq...

SECProto•2mo ago
> but was struggling (am still) to see how it relates to a wooden trough that merely holds cables.

Overhead Catenary [1] is a standard term, for a system that has two wires overhead - one suspended from the posts (forming a series of catenary curve), the other suspended from that cable at regular intervals (and held level relative to the track). The wood in Boston's system seems to replace the catenary cable.

[1] https://en.wikipedia.org/wiki/Overhead_line#Overhead_catenar...

IAmBroom•2mo ago
In a nutshell, the overhead power lines hang from their support points as catenary curves.

This is important to the design of trains, because you have to calculate the variance in height over the caternary length (highest at attachment point; lowest at somewhere near the middle, but depending on incline).

cbm-vic-20•2mo ago
I really like those service diagrams to show which stations are closed and how to get around them.
billfor•2mo ago
San Fransisco looked at replacing their metal ladders with wood and decided to keep making the wood ones. Sometimes there's good reasons to keep the old material, the least of which is that metal conducts electricity. Unfortunately there's not many people left that can maintain it and it's probably cheaper to just keep ordering metal replacements. It still doesn't mean it's better.

https://sf-fire.org/our-organization/division-support-servic...