Marco Chitti Profile picture
Aug 1, 2022 18 tweets 10 min read Read on X
1/ Someone once asked my how Lausanne, a tiny city of 140k in a metro area of 400k inhabitants, can get such high transit usage (800 trips/year per inh.) and even boast a metro.

After touring the city's network, I can really say the answer is: pragmatism and restraint.
2/ What do I mean for pragmatism and restraint? That the policymakers put incrementalism, functionality and ease-of-use on top of everything else as the guiding factors of how to improve and design their transit system.

This thread shows that, as always, Devil is in the details.
3/ Take M1, the first "metro" line of Lausanne.

It's really the closest thing to a North American LRT you can find in Europe. It uses high-level tramway rolling stock akin to German Stadtbahn and early NA LRTs

But it deliver a very high frequency (5 min!) on a single track line
4/ M1 stations are plain simple high level, narrow platforms with bus-like shelters. Crossing is at grade with perfectly timed barriers.
Only a few major stops, like EPFL, are more sophisticated, with bigger canopies, overpasses and lifts (Never escalators. Never).
5/ Grade separation is used with care. And even at major intersections there are barrier-protected crossings coordinated with traffic lights
Can you imagine a NA engineer designing an intersection where at peak barriers will go down every 2.5 minutes on avg.? What about LOS ?!?
6/ This amazingly pragmatic approach (making the minimum necessary to deliver a highly usable, reliable, accessible, and frequent service) is what makes also possible to have more grandiose design at important nodes, like Renens. Still, functionality and ease-of-flow is king
7/ The same can be said for M2. Born as a conversion of a funicular to rubber-tired metro with a further extension into the city, is an exercise in restraint and pragmatism that allowed the city to get its own little metro for some 500 million CHF.
8/ Take stations: Shallow sub-surface ones are essentially an u/g room with two lifts in the middle and one fixed stair at each end (reminiscent of Brescia and Copenhagen)
Access pavillons on the surface are the size of a bedroom, enough to fit a ticket vending machine + a board.
9/ Same approach for deeper stations, like Ours pictured here. A shaft containing 4 lifts (2 per platform). Very minimal fixed stairs that double as emergency exits. That makes for very small, cheap shafts.

On the surface, another very minimal pavillon containing the four lifts.
10/ Even a quite deep station like Ours, has street-to-platform walking times of roughly 20-25 seconds. An elevator ride.
11/ That also means tailoring solutions to very specific sites, like the amazing Bessières station built under the bridge of the same name. Just lifts connecting with both street levels (above and below). The "mezzanine" under the track is just a passage open to the nearby street
12/ And remark the details: painted walls, exposed concrete, basic paving and barebone metal stairs, some only 1 m wide! And no escalators.

Escalators can only be found at a few major stations.
13/ The appearance is not fancy, perhaps, but the layout of circulation at major nodes is quite good, especially at Flon (less so at Lausanne-Gares). This is what I call a seamless, effort-free transfert between the M2 (right) and the LEB railway (left)! And M1 is just steps away
14/ Finally the LEB, a local railway that instead of being shut down as it happened almost everywhere else, was upgraded into a frequent (15 minutes) suburban line with targeted improvements over time: grade separation, a new city terminus, high platforms etc.
15/ on top of that, an incredibly extensive trolleybus system that was not disinvested in favor of rail but actually improved. Most lines run at 10 minutes interval or better throughout the day until quite late at night.

Wires are everywhere and apparently nobody cares.
16/ The lessons we can learn from Lausanne are incrementalism (maintain and improve what exists continuously), network-thinking, and restraint & pragmatism as the leading design approaches.

Overall, the feeling of transit being a "public good" that lacks elsewhere.
17/ The result is a transit system that, like most in Switzerland, is characterized by the smoothness of use. Using transit to go around is as easy as breathing.
Many more little details add to that feeling, such as having ticket machine and shelters at (almost) every bus stop.
18/ Also, the preponderance of electric transit within the city and the low level of private traffic makes for a very noise-less experience of the city (the same can be said for Zurich), as ICE busses can be extremely noisy (a big issue in Bologna, for example).

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More from @ChittiMarco

Aug 1, 2024
It's always interesting to note how, unsurprisingly, the history of transportation planning is nested in the shifting larger paradigms of urban planning.

The only two sizable "greenfield" outlying sections of Frankfurt U-Bahn follow two different paradigms of urban integration. Image
The only greenfield section part of the overall pre-metro scheme built in the initial phases run either underground or in a freeway median, within an area of interwar (Romerstadt) and postwar modernist development.
Grade-separation was the "gold standard" for everything back then


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The 2000s addition to the U-Bahn network, serving the large greenfield development of Riedberg, whose own urban design reverts to the "traditional" perimeter block, run as a tramway on a street tree-lined median with signal-controlled intersections. Quite the change of paradigm.


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Read 5 tweets
Jul 31, 2024
One of the reasons why French tramways tend to be relatively slow is that they often have very curvy and zigzagging alignments. There are two main reasons for that, one linked to the history of urban development in France, the other to how and when French networks developed. Image
The historical reason is that France, outside of Paris intramuros, it's not a country of Grand Boulevards and large urban schemes. With one of the most property owners-friendly land regimes, French cities mostly grew with chaotic street patterns during both the 19th and 20th c.
Streets, even major radial arterials, tend to be narrow until the postwar era, outside of a few isolated redevelopment schemes, such as Grenoble's 20th c. boulevards or Bordeaux 18th c. Triangle. Provincial elites never indulged in the grandiose schemes of the capital city.
Read 7 tweets
Jul 24, 2024
Not only Seattle (and many other cities) opt for mined stations in city-center areas, but they also do it in the most bloated way, with full-length mezzanines and wide off-street access shafts.

Let's look at a more sober approach to mined stations from u/c Vienna's U5


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First, the Seattle approach (veru common in NA mined stations) is to go with a large cavern encompassing both tracks, a central platform and a "full-length mezzanine, that is a slab above the platform level allowing for horizontal circulation outside of platform space Image
The wide two-level single cavern is connected to the vertical shafts via two "transepts" (mined tunnels perpendicular to the cavern), as the shafts are built rigorously off-street. Additionally, a diagonal mined tunnel can host escalators.

This isn't the approach used in Wien
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Read 10 tweets
Jul 16, 2024
Today, the much-awaited, 5, 5 km, 8 station, metro line 6 in Naples was finally (re)opened* (with limited service) after a 40+ years-long saga that is emblematic of how the bad choices and habits of the 1980s still haunt Italy today.

A 🧵


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Naples' line 6 has a very troubled history. It was initially planned in the early 1980s as the "Linea Tranviaria Rapida", an LRT-like system mixing at-grade and grade-separated segments crossing the city East-West roughly along the coast. Image
It was planned following the approval of a national law encouraging the construction of "LRT-like" systems, to be built with local and national funds with the involvement of the state-controlled IRI conglomerate, via non-competitive 30 years "concessions of sole construction"
Read 17 tweets
Jun 10, 2024
A recent exchange in here reminded me that historically there has essentially been two main paths toward level boarding of mainline rail.

The prevalence of one type or the other in a country depends a lot of when and how the railway became a commuter-oriented mobility tool.

A🧵 Image
The 19th c. railways had very low platforms, just slightly higher than the tracks, either in wood, masonry, or simply a stone curb filled with gravel. Essentially, a glorified sidewalk.
That was ok for a railway with sparse traffic and generous dwelling times.
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But platforms that require passengers to climb several steps to get into the trains, whose boogie-mounted floors are often >100 cm high above the track, are unfit for the need of the higher frequency, high traffic railway catering to the hinterland-to-city commuters.
Read 18 tweets
Jun 5, 2024
How does Zurich achieve consistent running times and an elevated average speed on its legacy tramway network despite the fact that it's not fully running on dedicated lanes?

An example of urban integration and conflict management strategies along a segment of line 3

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Tramway line 3 covers the 4.3 km, 11-stop section between its terminus at Albisrieden to Sihlpost /HB in 16 minutes, with consistent running times throughout the say, averaging a pretty good 16 km/h speed.

How does it achieve these performances? Image
Let's start from line 3 western terminal loop, where the tram enters the general circulation protected by a traffic light and then continues along the central lanes of a suburban street. All lateral streets yield to the main arterial which is a "priority street" Image
Read 13 tweets

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