These Railroad workers are about to give you a little science in your day. Railroad Welding has been done for hundreds of years, its one of the staples of transportation and ingenuity. These workers in Sweden are using Thermite to better weld the nails and the tracks together. The extreme stress of the fire makes for better holding and will ensure these tracks last as long as humanly possible. Never thought you would see science and construction workers together, now did you?