TfL published some tables about Tube Capacity and they are amazing

Budge up. Image: Getty.

Have you ever wondered just how busy the tube is as you’re sardined in every morning? Or which the quietest tube line is in the depths of night?

Well it turns out that Transport for London (TfL) holds this data and quietly released it a few weeks ago in response to a written question to Sadiq Khan from Conservative London Assembly member Tony Devenish. He asked about the capacity on the tube and TfL decided to publish the data it has in the form of three excellent tables which I’m sure the audience of CityMetric will be poring over for some time.

So, most of this won’t be a surprise to many of you veteran commuters: trains being at or over capacity in the morning peak, busy again in the evening peak with a solid use through the rest of the day. However, the data does throw up some interesting nuggets of information about how busy the tube actually is.

Click to expand. Source: TfL.

One of the most surprising aspects is how busy the tube remains throughout the day. The Central Line in particular is at 66 per cent capacity from the moment the first train runs and doesn’t dip below 35 per cent throughout the rest of the day, even those late-night services past midnight. Indeed, all of the deep level lines are pretty well used all day.

In the morning peak between 8-9am, the 130 per cent capacity on the Northern Line will be a surprise to nobody, but that is nevertheless very high. The note underneath states that this was calculated this on the basis of standing at a density of 4 people per square metre, so 130 per cent is having 5 and a bit people in just a square metre, again something many of us are familiar with. The Central, Jubilee and Victoria Lines are also above 100 per cent, but it’s interesting to note the jump from 15 per cent to 82 per cent on the Waterloo & City (W&C) Line from 6-8am.

Compare that with just how quiet the Metropolitan and W&C are throughout the day and late at night. A grand total of no one uses the W&C before 6am (it isn’t open), with only 4 per cent using it after midnight. The other sub-surface lines are also relatively quiet after 9pm.

The other trend is the slight increase in use after 10pm on the Bakerloo, Central and Piccadilly Lines. This happens after the commuters go home by 8pm, so the usage dips before bouncing back. It is most likely due to more people making their way home after their evenings out in central London, but an interesting point.

Click to expand. Source: TfL.

The second table shows when capacity is over 50 per cent. Again, the Central Line is the busiest with 10 hours a day over half capacity, including before 6am, and the Northern remains busy until 9pm on a typical weekday.

However, the table shows the tube is only more than half full just 35 per cent of the time – something to remember when you’re crammed in at 8:34am. It would be interesting to see if the increase in flexible working has had an impact in recent years. And if you do work flexibly, you should get a quieter commute the earlier or later you head in – just avoid 8-9am.

Click to expand. Source: TfL.

The third table shows if all of the seats are taken on the tube. Amazingly they are all taken 71 per cent of the time, and are all taken all day on the Central, Jubilee and Victoria Lines. Again, the Metropolitan is your best bet for a seat, with seats being available for 14 hours a day. The W&C offers a seat for that short journey for 13 hours a day.


How might we expect these tables to change in the next few years? Well TfL recently announced it was extending the morning and evening peaks on the Victoria Line to three hours, with a train every 100 seconds, so those figures could drop. Also, the Four Lines Modernisation programme will see increased service on the Circle, District, Hammersmith & City and Metropolitan Lines from 2023, so again TfL will be hoping for those numbers to drop as more trains become available. It will also be interesting to see this table once the Elizabeth Line Crossrail opens.

Thinking further ahead, when the New Tube for London rolling stock upgrade progamme finally arrives from the middle of the next decade onwards, it’ll mean more trains on the Piccadilly and Central Lines initially, followed by the Bakerloo (which could be extended) and W&C. But with population growth expected to continue in London, will it make much of a difference to these tables? Probably not.

Now, to find out what this table would look like for Night Tube, Overground, DLR and Trams…

James Potts tweets @JamesPotts.  

 
 
 
 

The IPPC report on the melting ice caps makes for terrifying reading

A Greeland iceberg, 2007. Image: Getty.

Earlier this year, the Intergovernmental Panel on Climate Change (IPCC) – the UN body responsible for communicating the science of climate breakdown – released its long-awaited Special Report on the Ocean and Cryosphere in a Changing Climate.

Based on almost 7,000 peer-reviewed research articles, the report is a cutting-edge crash course in how human-caused climate breakdown is changing our ice and oceans and what it means for humanity and the living planet. In a nutshell, the news isn’t good.

Cryosphere in decline

Most of us rarely come into contact with the cryosphere, but it is a critical part of our climate system. The term refers to the frozen parts of our planet – the great ice sheets of Greenland and Antarctica, the icebergs that break off and drift in the oceans, the glaciers on our high mountain ranges, our winter snow, the ice on lakes and the polar oceans, and the frozen ground in much of the Arctic landscape called permafrost.

The cryosphere is shrinking. Snow cover is reducing, glaciers and ice sheets are melting and permafrost is thawing. We’ve known this for most of my 25-year career, but the report highlights that melting is accelerating, with potentially disastrous consequences for humanity and marine and high mountain ecosystems.

At the moment, we’re on track to lose more than half of all the permafrost by the end of the century. Thousands of roads and buildings sit on this frozen soil – and their foundations are slowly transitioning to mud. Permafrost also stores almost twice the amount of carbon as is present in the atmosphere. While increased plant growth may be able to offset some of the release of carbon from newly thawed soils, much will be released to the atmosphere, significantly accelerating the pace of global heating.

Sea ice is declining rapidly, and an ice-free Arctic ocean will become a regular summer occurrence as things stand. Indigenous peoples who live in the Arctic are already having to change how they hunt and travel, and some coastal communities are already planning for relocation. Populations of seals, walruses, polar bears, whales and other mammals and sea birds who depend on the ice may crash if sea ice is regularly absent. And as water in its bright-white solid form is much more effective at reflecting heat from the sun, its rapid loss is also accelerating global heating.

Glaciers are also melting. If emissions continue on their current trajectory, smaller glaciers will shrink by more than 80 per cent by the end of the century. This retreat will place increasing strain on the hundreds of millions of people globally who rely on glaciers for water, agriculture, and power. Dangerous landslides, avalanches, rockfalls and floods will become increasingly normal in mountain areas.


Rising oceans, rising problems

All this melting ice means that sea levels are rising. While seas rose globally by around 15cm during the 20th century, they’re now rising more than twice as fast –- and this rate is accelerating.

Thanks to research from myself and others, we now better understand how Antarctica and Greenland’s ice sheets interact with the oceans. As a result, the latest report has upgraded its long-term estimates for how much sea level is expected to rise. Uncertainties still remain, but we’re headed for a rise of between 60 and 110cm by 2100.

Of course, sea level isn’t static. Intense rainfall and cyclones – themselves exacerbated by climate breakdown – can cause water to surge metres above the normal level. The IPCC’s report is very clear: these extreme storm surges we used to expect once per century will now be expected every year by mid-century. In addition to rapidly curbing emissions, we must invest millions to protect at-risk coastal and low-lying areas from flooding and loss of life.

Ocean ecosystems

Up to now, the ocean has taken up more than 90 per cent of the excess heat in the global climate system. Warming to date has already reduced the mixing between water layers and, as a consequence, has reduced the supply of oxygen and nutrients for marine life. By 2100 the ocean will take up five to seven times more heat than it has done in the past 50 years if we don’t change our emissions trajectory. Marine heatwaves are also projected to be more intense, last longer and occur 50 times more often. To top it off, the ocean is becoming more acidic as it continues to absorb a proportion of the carbon dioxide we emit.

Collectively, these pressures place marine life across the globe under unprecedented threat. Some species may move to new waters, but others less able to adapt will decline or even die out. This could cause major problems for communities that depend on local seafood. As it stands, coral reefs – beautiful ecosystems that support thousands of species – will be nearly totally wiped out by the end of the century.

Between the lines

While the document makes some striking statements, it is actually relatively conservative with its conclusions – perhaps because it had to be approved by the 195 nations that ratify the IPCC’s reports. Right now, I would expect that sea level rise and ice melt will occur faster than the report predicts. Ten years ago, I might have said the opposite. But the latest science is painting an increasingly grave picture for the future of our oceans and cryosphere – particularly if we carry on with “business as usual”.

The difference between 1.5°C and 2°C of heating is especially important for the icy poles, which warm much faster than the global average. At 1.5°C of warming, the probability of an ice-free September in the Arctic ocean is one in 100. But at 2°C, we’d expect to see this happening about one-third of the time. Rising sea levels, ocean warming and acidification, melting glaciers, and permafrost also will also happen faster – and with it, the risks to humanity and the living planet increase. It’s up to us and the leaders we choose to stem the rising tide of climate and ecological breakdown.

Mark Brandon, Professor of Polar Oceanography, The Open University.

This article is republished from The Conversation under a Creative Commons license. Read the original article.