jm + tube   2

London's Tube has been running so long it's literally raising the temperature of the earth around it | CityMetric
London has been running tube trains so long that the ground beneath parts of the city is now as much as 10°C hotter than it was in 1900.
london  tube  underground  tfl  engineering  history  temperature  ventilation 
29 days ago by jm
Why sugar helped remove Victoria Line concrete flood
Sugar blocks concrete from setting. This I did not know
concrete  london  tube  flooding  sugar  chemistry  factoids 
january 2014 by jm

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