LONDON - AUGUST 4: Rail tracks are seen outside of Paddington station August 4, 2003 in London. Due to the risk of the tracks buckling on some lines if the heat reaches more than 30 degrees Celsius, Network Rail has lowered the maximum speed on those lines from 110mph to 60mph. Temperatures are expected to break the British record of 37.1 degrees Celsius by the middle of the week. (Photo by Bruno Vincent/Getty Images)
