Chicago: Images of train tracks on fire in Chicago have gone viral on social media recently. However, they have been set on fire for a very good reason - to combat the freezing temperatures and keep them operational.
A brutal cold wave has hit the American Midwest, bringing temperatures lower than those in Antarctica. According to Chicago Tribune, in such extreme weather, transport operator Metra uses fire to keep switches working and help with track repairs.
Extreme cold weather can cause steel to contract, causing breaks on train tracks, said Metra spokeswoman Meg Thomas-Reile to Chicago Tribune. While Metra uses continuously welded rail on most of the system, there are some locations near switches and some crossings where the rail is bolted together. These areas are most vulnerable to separating in frigid temperatures.
To repair the breaks, Metra heats the tracks with a rope soaked in kerosene that is laid along the base of the rail and lit on fire. The fire heats up the rail and once it expands, workers pull the rails back together and rebolt them or weld them.
The whole process has made for some mesmerising pictures and videos that have gone viral on social media.
CNN reports that Metra says it's safe to run the trains over the flames because the diesel fuel in the trains "combusts only with pressure and heat, not open flames."
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