Automation and Safety

Since the recent Amtrak crash, I’ve seen people in several places…including here…suggesting that engineers should be eliminated and trains operated entirely by automatic control. Here is a cautionary tale about such automation, which I originally posted about a year ago under the title Blood on the Tracks. I’ve added a few thoughts at the end.

Kevin Meyer has a thought-provoking post (referencing, among other things, the Asiana Flight 214 crash)  on achieving the right balance between manual and automatic control of systems.  His post reminded me of something that has been lurking in my queue of things-to-blog-about for a long time.

On January 6, 1996, Washington Metrorail train T-111 departed the Rockville (MD) station northbound.  Operating under automatic control as was standard practice, the train accelerated to a speed of 75 mph, and then began slowing for a station stop at Shady Grove. The speed was still too great for the icy rail conditions, however, and T-111 slid into a stopped train at the station, killing the driver.

What happened?  I think the answer to this question is relevant not only to the specific topics of mass transit and railroad safety, but also to the more general issues of manual and automatic operation in system design, and perhaps even to the architecture of organizations and political systems.

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Trains are Indefensible

I remember as a kid watching “Lawrence of Arabia” where he led Arab raiding parties against the Turkish train lines in WW1.  Per this PBS article about Lawrence:

With the Ottoman army spread thinly across the empty vastness of the Arabian Peninsula, the Hejaz Arabs found it relatively easy to strike and sabotage Turkish lines of communication and supply. With the Red Sea firmly in British hands, the Turks had no option but to use the Hejaz railway to move their men, supplies and munitions.  

Lawrence and the Arabs spent much of their two years on the road to Damascus destroying sections of the railway. Small units of men laid charges on the track. Then as the Turks defended the track, Lawrence’s men formed large moving columns capable of rapid hit-and-run operations. 

In the recent train crash in the East Coast there are discussions of a “projectile” hitting the train and distracting the conductor.  While this hasn’t been confirmed, it is relevant to consider how difficult it would be to secure train lines from attack or sabotage.

This discussion is much more relevant in the context of “high speed trains”.  There is a broad theme among many that the US is behind because we have not invested large sums of public money in high speed trains, that we are “falling behind”.  Per wikipedia the Japanese high speed trains (similar to the Chinese high speed trains) typically have more than 1000 passengers on each of their trains.

The USA has far larger distances than the Japanese trains.  If you built a train from Chicago to New York, for example, it would be almost 800 miles long.  This is for a single rail line.  Obviously to connect the major cities of the USA you’d have thousands of miles of train lines.

How would these train lines be defended?  It would be easy for a terrorist to just cut through the fence somewhere and park a cement truck on the tracks, for instance.  The ensuing carnage would easily accomplish what 5-10 hijackings could accomplish.

If you think that the Homeland Security plans are over-reaching, just wait to see what it would take to defend hundreds or thousands of miles of track.  Instead of having a bottleneck at the airport, the entire line would be a potential point of attack.  Even if defenses were erected, they would only have to overwhelm them at a single weak link in order to assault the train.

No one is incorporating this into their cost estimates for high speed trains; they likely have fences and barriers but are not contemplating stopping a determined, armed attack by terrorists.  They should, because after one such attack a giant post-haste effort would emerge kind of like our early days of the TSA.  They should contemplate and include a giant, armed, unionized Federal bureaucracy in their midst and add this into their cost estimates and see how it compares against highways and aircraft.  The numbers, already dubious, would then be far, far in the red.

Cross posted at LITGM

Technology and Mass Transit

I have not seen a formal study of the impact of technology on mass transit but I believe that it has made it profoundly more valuable and useful. And I accidentally participated in an experiment that partially proved this statement in the inverse.

In Chicago they have a CTA “bus tracker” that tells you when a particular bus will arrive at your stop. Or you can program it so that you can see all the buses from various routes that are coming past your stop (this is useful because in Chicago you can often take many different routes that go to the same place over shorter distances). It works on your phone and many of the newer stops have the bus tracker programmed into the canopy so you don’t even need to look it up on your phone.

Sadly enough most days rather than looking up the street for buses I check the bus tracker. I can usually get from my condo down the elevator and past the lobby in 2-3 minutes so 4 minutes is the cut off time. One morning I looked and I thought I had missed the bus entirely because the next one was ten minutes away on my phone. However, instead of just trudging off, I looked up, and a bus was right there!

I got on the bus and it was completely empty! Not a soul was on the bus. While it was a nice day, usually this bus line was crowded during rush hour, often so crowded that I don’t even bother getting on because I have to stand right in the front past the yellow line where you aren’t supposed to stand and then get on and off with every stop (to let people on and off) until the crowd thins out.

The driver was totally bewildered too. I sat with her up front and I guess they had changed the bus she was driving to this route (from another route) and they hadn’t updated bus tracker. I said that because she didn’t show up on my bus tracker. Thus no one was on the bus – because if it wasn’t on bus tracker, it didn’t exist.

I am sure that the River North area is one of the most technologically sophisticated areas of the city and probably in other parts of town people just wait at the bus stop for the bus to show up. But in River North – everyone has been trained to use bus tracker and rely on it and they wouldn’t contemplate a bus existing that wasn’t on bus tracker.

For me, the bus tracker has made the Chicago bus go from something marginally useful to a highly useful way to get around town. When I lived in Bucktown we used to wait for the #50 Damen bus and 3 of 4 times we’d give up and grab a cab after waiting 15-20 minutes and the 4th time 2-3 buses would show up in a big bunch full of angry riders. If you took the bus you weren’t happy about it; it was an unreliable and slow way to get around.

However, bus tracker is very reliable and now you have visibility of what is coming and you can plan ahead so that you are whiling away your day standing outside in the rain or snow waiting in vain for a bus that seems like it will never come. I don’t have statistics but I would bet that bus tracker increases utilization of assets for the CTA and has become a known and reliable method of transportation for those that give it a chance.

Cross posted at LITGM

25 Stories About Work – “Don’t Run” and Rental Cars

I was recently on a plane doodling and thought of some funny / interesting stories from 25+ years of working and traveling. So I decided to write them up as short, random chapters of a non-book with the title of this post. Hope you enjoy them and / or find them interesting. Certainly the value will be at least equal to the marginal cost of the book (zero)…

The Midwest, late 1990s

Along with air travel, renting a car is part and parcel of the traveling business person’s experience. Over the years I have rented hundreds if not a thousand rental cars at airports across the USA.

In the earliest days we’d always get a map from the rental car agency and then use it to navigate our way around town. Rental cars are typically near the airport and kind of tucked away often with lousy signage, so you need to know how to find your way out and how to find your way back. Nowadays most of the airports have a “single system” for rental cars where all the buses drop you off at the same facility, but back in the day each one had their own pros and cons.

The big innovation in rental cars came when Hertz implemented “Neverlost”. Neverlost was the first in-car navigation system that I was aware of and we started getting it in their cars in the mid to late 1990s. Neverlost spoke to you as a woman in an English accent and she was forever telling me to

Return to the designated route

In her peeved manner whenever I made a wrong turn or disobeyed her orders. Any sort of new directions took a long time to take effect, and the system was remarkably clunky compared to what’s available on your smartphone, but back then it seemed like an enormous leap forward. One negative element of this is that I started listening to the machine rather than learning the cities I drove through – in particular Memphis is a city I should have explored with a map but instead sat like a zombie and was told what to do by machine.

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