Much of the technology in the NY subway hasn't been updated in over 100 years
businessinsider.com
businessinsider.com
Most of the NYC subway signaling technology is relay-based from the 1950s, so it's not quite a century old. Those lever machines at West 4th St shown by Business Insider are rare; almost everything is electrical.[2] The 1950s technology from General Railway Signal is quite good; it's just high-maintenance. Here's a 1950s era panel, running automatically and unattended during off peak hours.[3]
That technology really is quite good. All vital relays are open in the stop condition. All broken wires result in red signals. This is a basic design principle of classic railroad signaling. The mechanism for stopping trains[2] is brutally simple; a steel train stop comes up at red signals which, if a train tries to pass it, will be hit by a valve lever on each subway car which will directly trip the air brakes. The position of those levers is monitored by circuits which insure that there are always train stops in the up position between trains. If a train stop lever won't go up (ice, mechanical breakage, somebody or something holding it down) the previous train stop won't go down, maintaining protection, and signals will be forced red until the problem is fixed.
One reason it hasn't been replaced is that the newer technologies don't have as good a track record. The old stuff is very rugged, and is known to survive dirt, ice, snow, vandalism, traction power, vibration, rocks, water, and idiots.
[1] http://gothamist.com/2015/07/28/subway_steampunk_video.php [2] http://nycsubway.org/wiki/Subway_Signals:_Train_Stops [3] https://www.youtube.com/watch?v=RStJ621auaU
https://en.wikipedia.org/wiki/Survivorship_bias
...now, we should figure out why the older stuff lasts longer. But it's inevitable that the older stuff is more durable. If it weren't, it wouldn't exist.
Now then, we do still create technology which lasts - it's just not as frequently found in consumer tech. Take stoplight timing switches as an example. They use electronics, and work in some incredibly extreme environments, and are reliable more often than not.
And survivorship bias cant really be used for a tube line as opposed to a widget off of a production line.
A tube line is a one off custom system.
But now a host of secondary problems had to be solved. Soldering of PC boards wasn't a reliable mass production process yet. Plastic cased ICs weren't perfectly airtight. Connectors were not yet reliable. IC line quality wasn't consistent. IC wire bonding was done by hand. "Purple plague", caused by contamination from the wire bonding process, corroded ICs internally. Phenolic PC boards were subject to hairline cracks. ICs lacked electrostatic discharge protection on pins and static electricity could easily damage them. Power supples could not maintain voltage during power line sags and spikes. RF shielding was poor; devices both emitted too much RF and were sensitive to RF in the area. Many signals between boards and units were relative to ground, not differential, and ground loops were a problem. On top of all this, it took a lot of components to do anything, so everything had a high part count and many interconnects, all points of failure.
Every one of those problems has been solved. But that's why 1970s electronic devices were troublesome, and didn't age well.
Now, though, we have electromigration. Slowly, atoms creep across barriers just from statistical diffusion helped by electric fields. This is a very slow process, but with IC features so small, not that many atoms have to move before something fails. It's possible to make high-reliability electronics at a larger line size with current quality fab technology, and this is done for aerospace and some automotive applications.[1] Still, few consumer parts today have a design life longer than 20 years.
[1] http://www.freescale.com/products/ultra-reliable-microcontro...
It's like, people complain about how shitty reporting is these days, but when a publication puts some time and effort into its stories, people complain about how they ripped off a rag that covered the story earlier even though they did a shitty job at it.
http://techland.time.com/2012/04/02/25-years-of-ibms-os2-the...
> Try though it might, IBM couldn’t force an unwilling world to use OS/2 as its primary operating system. But it also couldn’t extinguish demand for the system simply by declaring that it wasn’t going to sell or support it anymore, an announcement it made in 2005. In 2012, OS/2 is invisible to the naked eye, but it’s still out there, in more places than you’d think.
> In New York City’s subway system, for instance, the travelers who gain entrance by swiping their MetroCards over 5 million times each weekday do so with the assistance of IBM’s theoretically defunct software. “While OS/2 is not running any visible part of the system, it does serve an essential purpose, and there are hundreds of OS/2 computers in service,” says Neil Waldhauer, a consultant who helps New York City Transit and other clients keep their OS/2 applications running.
> “OS/2 is not a superior solution in the places where it is still in use,” he explains. “Rather, it is a vital part of a larger system. Many enterprises have big investments in OS/2 programs that have no equivalent on other operating system … For many users, it would be expensive or inconvenient to move years or decades of their data and programs to a new platform. Replacing OS/2 would mean replacing their entire system.”
It's a shame the OSFree project has never got much support, it would be great if it got to the point where it could run gui apps.
The big issue was that OS/2's kernel operated in Ring 0, and no existing virtualization/emulation systems supported the relevant CPU instructions.
I wonder if that bank is still running on OS/2... :P
Anybody know anything they're willing to share publicly?
I discuss in more detail here: https://news.ycombinator.com/item?id=10247109
This article even hints at it: Installing the system on the L train took over six years, with multiple delays and cost overruns reaching $288 million. The so-called "robot trains" require far fewer operators, too, which drew ire from the Local 100 of the Transport Workers Union of America.
It's hard to compare construction and maintenance costs between two different cities where one has 30% more track and 10x the square mileage AND is 24hours in operation.
https://pedestrianobservations.wordpress.com/2013/06/03/comp...
(Admittedly, one of the Sao Paolo lines is 16% above ground.)
If they can get cheaper labour for construction, than only because they make it easier to import cheap labour, because they have saner visa policies.
https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&...
However, due to exceedingly powerful transit unions, labor costs are higher in the specific case of infrastructure. As I said, waste.
I think NYC is a bit of a perfect storm situation:
- 24 hour operations
- High labor costs, coupled with strong unions
- Legacy infrastructure to maintain (vs. new subways)
- extremely dense infrastructure to manage (NYC under-street infrastructure is famously messy/complex)
- Huge distance of track to maintain
- Large square mileage of city area to contend with
Surely this has to play a big part in the cost of building subways in NYC vs. simply, "The MTA wastes money"?
See also these tweets (also from the linked thread) and various others by MarketUrbanism: https://twitter.com/MarketUrbanism/status/639265131885686784 https://twitter.com/MarketUrbanism/status/639445006084886529
Apparently turf wars ("Your job is to keep the LIRR out of Grand Central") and union contracts do contribute a lot to this perfect storm. I don't understand why you disagree with my use of the word "waste" to describe this.
The second avenue subway is way over-budget, will take far longer than it should have to build, and is poorly designed. But when it is finally done it will bring a lot of value to a lot of people's lives. The same cannot be said of the F35.
It looks a lot like a physical version of a new signalling centre in the UK [1], except that uses monitors, which presumably make it easier to update the "board". Many of the diagrams are visible online, since there's an open data feed [2] (this one is about half the London Overground in London, orange on the familiar map).
[1] http://www.railengineer.uk/wp-content/uploads/Sig04-online-9...
The only difference is funding. NYC subways remain woefully underfunded. There's no big secret of what it would take to fully fund a clean subway system. The answer is $100 M a year [1]. Now, should the capital infrastructure cost less? Of course. But there is no reason for the economic arterial system of the whole region to remain so filthy in the meantime.
The only potential revenue source that could credibly provide the MTA with the money it needs to bring all stations to a "State of Good Repair" [2], install valuable upgrades like train locator screens and sliding platform doors, and keep the stations clean is a congestion tax like Move NY [3].
A congestion tax would also have the benefit of making Manhattan a much more walkable and ridable city and would even make rush hour taxis move faster. But until there's political will to implement a congestion tax, I don't expect any meaningful improvements in the subways.
[1] http://secondavenuesagas.com/2008/09/30/cleaning-the-system-... [2] http://secondavenuesagas.com/2015/09/10/cbc-mtas-state-of-go... [3] http://iheartmoveny.org/
The subways are generally not that different in cleanliness from the corresponding streets and sidewalks above them. You could ask a different question, which is why NYC as a whole is not very clean, but that's a much more involved and complicated question than this facile complaint.
[1] http://www.nj.com/news/index.ssf/2015/01/whats_the_real_reas...
Other options include bringing back the commuter tax which was foolishly eliminated for short-term political gain, and getting more of our money back from Albany and/or Washington.
The times I've watched it, they do an incredibly lazy job, so the net result is not much cleaning. If the goal was "clean the platform" instead of "look like you're cleaning the platform", the system would probably be a lot cleaner.
The MTA has a large number of labor relations problems they need to fix. That's what's really holding them back.
(I also watched an interesting exchange recently. Someone jumps the turnstile. Someone reports that to the station agent, who just watched it happen. She replies "are you sure, I didn't see that", and went back to playing with her phone. This attitude of neglect completely kills the "if you see something, say something" culture the MTA tries to instill. If I see something, I'll keep it to myself to avoid the ridicule I'd receive from the employees or police.)
There is also organizational debt: http://steveblank.com/2015/05/19/organizational-debt-is-like...
This article seems to be an example infrastructure debt.
Think about it that way: It's a system where over time all the "bugs" have been identified, resolved and failure modes mitigated. If you were to replace the system with something new, you'd likely introduce the same old bugs, and new ones, without zero operational gain. Train tracks are rather fixed in their operation; in fact their design is dictated by the train movements. Changes in possible train movements come with changes to the tracks, and those changes are easily reflected by hardwired circuitry.
I'm just repeating the press statements of London Underground, who have been investing in new trains and signalling systems for the past 10-15 years. (It follows a long period of under-investment.)
New equipment does bring new bugs, which is why they introduce new trains on 'spare' track at night (without passengers), then with passengers on Sunday nights, then Sunday mornings, etc.
However when it comes to the tracks and signaling, there's only very little to be gained to have the actual signalling being computerized on a standard two track railway with the occassional switch track.
The distance between trains, both in time and space, is determined by the blocking of the tracks. There's a hard constraint on the minimum distance between blocks: For any given train running a track, it must be able to come to a full stop within the length of a block. And for safety reasons there must be at least two free blocks between trains (exercise to the reader: why two blocks? Hint: Emergency braking).
Now there is of course the possibility to subdivide a track into microblocks, where a fixed number of microblocks make up a "block" and the "block" borders are dynamically moving along with the trains on a track, so that there's always two blocks of distance between them. But again, this does not require a programmable computer to implement. It can be done using hardwired circuitry (and I'd feel much safer using such a system); just throw a few 74HCT… ICs onto a PCB and mass manufacture that.
Relative to how much it is used I wonder why they just don't throw money at the problem to make it a more attractive way of transportation instead of being only a necessity.
In other words, subway is efficient because it is always competitive with the congestion over ground, and even if it is creepy, it continues to be used.
"It works well enough, sort of, so don't touch it."
A "progressive" city can still have legacy parts, and those legacy parts are supplemented by custom features. All regular NYC Buses are handicap accessible. There are 24/7, door-to-door, paratransit services for handicapped people that cost the same as a subway fare [0]. Sure, the NYC Subway isn't Seoul or Singapore's, but it runs 24/7 (Seoul's only runs 5:30-Midnight) and the stations on average are probably ~20-30 years older than the oldest parts of the Seoul Metro (early 70s). The unofficial handicapped accessible subway map is depressingly sparse [1], but it seems on par with London's [2] and better than Paris' [3]. (Neither of which are 24 hour systems, BTW.)
I'll admit that the surfaces are gross and the subway collects the most unfortunate, down on their luck members of society, but your post reads as a total condemnation of the best mass transit system in the US. It's dirty and depressing at times, but it's also one of the great equalizers in New York City life.
[0] http://web.mta.info/nyct/paratran/guide.htm#what_is
[1] https://subwayrecord.files.wordpress.com/2015/03/ada-subway-...
[2] http://content.tfl.gov.uk/step-free-tube-guide-map.pdf
[3] http://parisbytrain.com/wp-content/uploads/2008/09/plan_pbs....
I'm not excusing the cost overruns and budget mishaps the MTA is prone to, but these stereotypes of a cesspool-like NYC mass transit are dated and a disservice to their actual typical operating conditions.
But your point would work if you'd chosen 2am on Monday.
Copenhagen's metro runs 24 hours a day, every day, but it's small and new (and entirely automated).
FWIW... I love the NYC Subway, and wish there was more money/attention paid to it. (Especially seeing the metros of other cites in the world.
But underneath the grime there's some really gorgeous stuff down there. The original tile signs from the days of the IRT and BMT (and even some of the IND) are lovely, and have much more personality than any other subway I've taken.
These sorts of things: https://www.pinterest.com/fennecfoxen/old-subway-signs/
http://nyclovesnyc.blogspot.de/2012/12/new-years-eve-themed-...
I'm not currently living in NYC, but a big perk of my yearly visit is being surprised and delighted with the new things that have popped up.
The London Underground seems reasonably clean to me, but I used to live there. It's closed overnight, but it's also cleaned during the day — you will see a cleaner on many trips you make in the evening, and trains are often (usually?) cleaned quickly when they reach the end of the line.
Stockholm Metro also has some wonderful design, although it's modern.
[1] https://www.google.dk/search?q=leslie+london+underground+til...
http://www.theguardian.com/cities/gallery/2015/oct/20/art-st...
You can compare apples to staplers by comparing it to other systems that don't do that, but that misses the point. When one actually moves here you start to realize just how the whole thing works, and realize that systems that close at night, or don't have express trains, are just hopelessly inferior and not a valid basis for comparison.
Those photos are depressing -- especially the one showing people in a dinky office waiting to pull metal levers manually so trains in the network can pass safely.
Anyone would agree the NYC subway system is mission-critical (without it, NYC would slow down to a crawl), yet its technology infrastructure has obviously been neglected for decades, due to lack of money, lousy management, corruption, or a combination of all these factors.
And no one wants to pay higher fares or greater taxes.
There's actually billions of dollars being spent on projects like the 2nd Avenue line and the recently completed extension of the #7 train. For some reason, the powers that be consider this more essential than updating the ancient signalling infrastructure and maintaining the crumbling stations.
Upgrading signalling on a train line would make life better for many more people than building one new station: trains would be able to run more often (which would make them less crowded) and the system would break down less often (the ancient signalling hardware is currently the least reliable part of the system). I heard that the new signalling on the L line is economically reviving a large part of Brooklyn now that it has reliable train service to Manhattan.
And wouldn't people who suffer daily from late and crowded trains and have to deal with leaky stations with perpetually broken elevators be likely to vote against the current politicians when they run for re-election?
The legacy-part would also happen with maintenance (be the one who brings the system into 21. century) - but only after many years would this leak into history-books. Not fast enough to win the next election.
Esp. if you are a local politician, who got the local construction for the extension, this might make a difference in incentives.
It is of course fun and exciting if we are talking about spotify for dogs, not as fun when talking about critical infrastructure.
https://en.m.wikipedia.org/wiki/Shanghai_Metro#Future_expans...
The MTA also has an arcane governance structure that makes for poor accountability. Four votes on its board are picked by the NYC mayor, 1 each by the county executives of Nassau, Suffolk, and Westchester, 1/4 each by the county executives of Dutchess, Orange, Rockland, and Putnam counties and six by the Governor of the state.
For what exactly? Something almost no one interacts with is new for the sake of new?
Here on HN where its assume high tech is necessary to scale because of high growth, the subway provides a view, however temporary, of another world where once technology scales "enough", new is no longer a relevant goal, aside from maintenance costs.
One big problem with a forklift upgrade of a fifty year old system is the short term maintenance cost of the new system is lower (or, more accurately is unknown, but optimistically assumed to be lower) however the total net systemic cost over the next half century is likely to be much higher for the new system... after all, its very easy to rebuild 1950s and older technology, but near impossible to repair 2010s technology. I'm claiming (cost of maintaining old system 1950 to 2050) < (old system from 1950-2000) + (new system 2000-ish to 2050). We know we can afford the budget cost of maintaining pre-1950s gear in 2015... those costs will only drop with technology, but we know its impossible to internally maintain 2015 gear now and it may never be possible.
I don't know enough to say with any certainty if they've reached it yet, but I think they may have.
I know there is a huge obsession with new and shiny amongst programmers, but when it comes to massive real world infrastructure projects the last thing you want is unknown factors and "churn", especially when the benefits are unclear and dubious at best.
Just because something is old, dosent mean it should be upgraded, infact if its worked well for as long as it has you should consider that very carefully first.
There is absolutely no need to upgrade this particular piece of infrastructure; it won't increase the throughput of trains through the interlocking, and it won't be easier to maintain. This stuff is _simple_ and works fine.
The upgrade to CBTC seems like a scam from the contractors to me. The Canarise Line was upgraded to CBTC, which can handle 26 trains per hour as opposed to the 12 trains per hour of the ABS signalling. 12 trains per hour is one train every 5 minutes. But they run trains every 6 minutes anyway -- there is no period in the timetable where they run 26 trains per hour, or even 2 individual trains at that spacing. (There is a period where they claim "every 4-6 minutes", for a maximum of 15tph if indeed there are two trains 4 minutes apart. I've just missed a lot of L trains, and waiting 6 minutes seems like "a good day" to me. As I understand it, the L gets most of its load from one station, and so it takes longer than the best headway just to load passengers there. Then, they can't turn trains quickly enough at the terminal. They blame the track layout but it's actually their relaying procedure that's the problem.)