So are trams really better than buses?

A tram in Milan. Image: Getty.

Look! A tram! Here’s another:

Melbourne. Image: Getty.

My god, they’re everywhere!

Manchester. Pleasing that all these cities start with M, isn't it? Image: Getty.

In all, according to this helpful and informative guide by the Prague transport authorities (in Czech) there are 265 active tram systems in Europe. Which is quite a lot of trams.

In some countries, though, there are a lot less than there once were. As anyone who’d seen Who Framed Roger Rabbit will know, in the 1950s, the “streetcar” networks that had fuelled the growth of American suburbia were ripped up to create more space for the motor car. British tram systems generally died at the same time.

And, the thing is... it’s not immediately obvious that this was the wrong decision. Trams, after all, are basically less flexible buses: they take up space on roads, they’re relatively low capacity, and you can’t make them go where you want.

Except – people love trams, don’t they? If they were talking about building a new tram line near your home, then you’d probably be quite excited about that. If they were talking about a new bus route? Well, probably not so much.

So what gives? Are trams really just, as the Economist Explains once explained, “a waste of money”? Or is there some rational reason for our attachment to them?

Two rails good, no rails bad

First, let’s run through the case for trams.


They’re visible

You can tell if a tram line runs down the street you’re standing on: there will be subtle hints, like the massive steel rails in the road. Permanent lines are more likely to encourage permanent stops and network maps. And, as the entire existence of Citymetric has served to prove, it’s the maps people get excited by.

So, if you want legibility in your transport system, trams, not buses, are the way to go.

They can’t be removed on a whim

Okay, they’re harder to build – but that’s actually a plus, in its way. Rails have an air of permanence that bus routes lack. That makes it easier for residents to plan journeys, employers to decide where to base themselves, and so forth, without worrying that the transport links they rely on are suddenly going to vanish.

They’re cleaner

No spewing out exhaust fumes, at least in the city itself. (If they take their electricity from fossil fuel power stations, they may be doing it elsewhere, of course, but still.)

They’re easier to segregate

Which is good as it means they’re less prone to disruption by things like traffic jams.

Okay, technically you can achieve this by segregating bus lanes, too... but those are pretty easy to undo, and the authorities are likely to come under pressure to undo just that. (After all, why should one category of vehicle get special treatment, just because it’s way more efficient?) A segregated tram route is likely to stay segregated.

Oh, and you can give them priority at signals, too. All of which means...

They’re faster and more predictable

None of this “getting stuck in traffic for ages and then turning up in groups of three”. Passengers can be reasonably certain that, when the information board says there’ll be a tram in five minutes, there’ll be a tram in five minutes.

They’re more comfortable

Stand on a bus, and you risk getting thrown all over the place as every time it brakes sharply. But trams tend to brake and accelerate more gently, so you’re relatively comfortable, even if you’re standing the whole way.

Oh, and you can extend trams by adding extra cars during rush hour, without clogging the road or hiring more drivers. Try doing that with buses.

So, they’re higher capacity, too.

Look, they’re just better, alright?

Trams are seen as good for regeneration and place-making – partly because they encourage development, partly because building them is so expensive and complicated that it often ends up used as an excuse to achieve those things.

But also because they are just cooler. The bells! The whirring sounds! The screeching noise they make when they go round corners! How many times have you gone to a strange city and found yourself thinking, “Oooh look, a bus”? Unless you’re a tourists visiting London for the first time, I’m going to guess the answer was: never.

Trams, though. Trams are brilliant.

Two rails good, no rails better

Except, are they? Because they also come with some downsides.

They can’t be removed on a whim

Once you’ve put in a tram, you’re stuck with it. If you mucked up the planning and it goes to slightly the wrong place? Well, tough. Too expensive to change it.

They don’t mix well with bikes

Don’t get stuck between rail and pavement if you value your continuing existence.

They take up too much space  

To get most of the advantages listed above you need to give trams segregated road space – and space is at a premium in most cities.

So: trams come with a huge opportunity cost. A tram lane is something you can’t use for something else.

They can’t move around obstacles

Trams are great if you can segregate them properly. But sometimes you can’t – see above – and when that happens you’re stuffed. They’re on rails, so can’t move around blocks in the road. A bus, with difficulty, can.

The big downside, though, is:

They cost a fortune

You have to lay new track. You have to redesign roads. Then you have to buy the vehicles, which generally cost more than buses. Oh, and they may be more expensive to run (research on this seems to vary).

Why bother, when you can achieve most of the same transport goals with a fleet of buses?

Well – I explained why you’d bother above. There are good reasons for it. But whether there are enough good reasons is going to depend not just on the circumstances in every individual city, but on the political and economic cycle too.

Trams are brilliant. But you don’t have to look far for reasons why they declined in some countries – or why they’ve been so slow to return.

Still, trams, eh? Phwoar.

Jonn Elledge is the editor of CityMetric. He is on Twitter, far too much, as @jonnelledge.

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To beat rising temperatures, Vienna launches a network of 'Cool Streets'

A Vienna resident cools off at one of the city's new Cool Streets installations. (Courtesy Christian Fürthner/Mobilitätsagentur Wien)

Over the past several months, Austria has recorded its highest unemployment rate since World War II, thanks to the economic aftermath of the Covid-19 pandemic. With no job or a suddenly smaller income – not to mention the continued threat of the virus – many Viennese will opt for a staycation this summer.  

At the same time, last year, Austria’s capital experienced 39 days with temperatures of over 30°C (86°F), one of its hottest summers in history according to the Central Institute for Meteorology and Geodynamics.

Climate experts expect a similarly sizzling 2020 season, and city officials are now doubling down on efforts to combat the heat by launching a “Cool Streets” initiative as well as a new, state-of-the-art cooling park.

“As the city councilwoman in charge of climate, it is my job to ensure local cooling,” Vienna’s deputy mayor Birgit Hebein proclaimed at the opening of one of 22 new “Cool Streets” on 22 June.

“In Austria, there are already more heat deaths than traffic fatalities,” she added.

Hebein was referring to the 766 people the Austrian Agency for Health and Food Security included in its 2018 heat-associated mortality statistics. The number was up by 31% compared to 2017, and in contrast to the 409 people who died in traffic collisions the same year.

The project includes 18 temporary Cool Streets located across the city, plus four roads that will be redesigned permanently and designated as “Cool Streets Plus”.

“The Plus version includes the planting of trees. Brighter surfaces, which reflect less heat, replace asphalt in addition to the installation of shadow or water elements,” said Kathrin Ivancsits, spokeswoman for the city-owned bureau Mobilitätsagentur, which is coordinating the project.


Vienna's seasonal Cool Streets provide shady places to rest and are closed to cars. (Petra Loho for CityMetric)

In addition to mobile shade dispensers and seating possibilities amid more greenery provided by potted plants, each street features a steel column offering drinking water and spray cooling. The temporary Cool Streets will also remain car-free until 20 September.

A sensor in the granite base releases drinking water and pushes it through 34 nozzles whenever the outside temperature reaches 25°C (77°F) . As soon as the ambient temperature drops to 23°C (73°F), the sensor, which operates from 10 a.m. to 8 p.m., turns off the water supply.

The sensors were included in part to allay concerns about legionella, a pathogenic bacteria that can reproduce in water.  

“When the spray stops, the system drains, and therefore no microbial contamination can develop,” said Dr. Hans-Peter Hutter, deputy head of the Department of Environmental Health at the Center for Public Health at Medical University Vienna, in a televised interview.

Hutter also assured the public that there is no increased risk of a Covid-19 infection from the spray as long as people adhere to the one-meter social distance requirement.


But Samer Bagaeen of the University of Kent's School of Architecture and Planning notes that air cooling systems, like the ones used in Germany at abattoirs, have been found recently to be a risk factor for Covid-19 outbreaks.

“The same could be said for spay devices,” he warned.

Vienna’s district councils selected the 22 Cool Street locations with the help of the city’s Urban Heat Vulnerability Index. The map shows where most people suffer from heat by evaluating temperature data, green and water-related infrastructure, and demographic data.

“Urban heat islands can occur when cities replace the natural land cover with dense concentrations of pavement, buildings, and other surfaces that absorb and retain heat,” as the US Environmental Protection Agency states.


A rendering of Vienna's planned park featuring a Coolspot, which is scheduled to open in August. Click to expand.
(Courtesy Carla Lo Landscape Architecture)

Vienna’s sixth district, Mariahilf, is such an area. The construction of the capital’s first “Cooling Park”, a €1 million project covering the 10,600 square-metre Esterházypark, is designed to provide relief. 

Green4Cities, a centre of excellence for green infrastructure in urban areas, designed the park’s main attraction, the “Coolspot”. The nearly 3.40-metre high steel trellis holds three rings equipped with spray nozzles. Textile shading slats, tensioned with steel cables, cover them.

The effects of evaporation and evapotranspiration create a cooler microclimate around the 30 square-metre seating area, alongside other spray spots selectively scattered across the park.

The high-pressure spray also deposits tiny droplets on plant and tree leaves, which stimulates them to sweat even more. All together, these collective measures help to cool their surroundings by up to six degrees.

The landscape architect Carla Lo and her team planned what she calls the “low-tech” park components. “Plants are an essential design element of the Cooling Park,” Lo says. “By unsealing the [soil], we can add new grass, herbaceous beds, and more climate-resistant trees to the existing cultivation”.

Light-coloured, natural stone punctuated by grass seams replaces the old concrete surfaces, and wooden benches meander throughout the park.

Living near the park and yearning for an urban escape close by, Lo says she’s motivated to ensure the park is completed by mid-August.

“If we don't do anything, Vienna will be another eight degrees Celsius hotter in 2050 than it already is,” Hebein said.

Vienna recently came in first in the World's 10 Greenest Cities Index by the consulting agency Resonance.

“There is no one size fits all on how cities respond to urban heat,” says the University of Kent’s Bagaeen, who points out that Vienna was one of the first European cities to set up an Urban Heat Islands Strategic Plan in 2015.

In the short term, prognoses on the city’s future development may be more difficult: Vienna votes this autumn.

Petra Loho is a journalist and photographer based in Austria.