Explaining The Universe on Instagram: "@ExplainingTheUniverse teaches you something NEW everyday day 🧠💫 Repairing train tracks is a careful process to keep railways safe and smooth for trains. When damage or wear is found, crews first inspect the site to see if rails, ties, or ballast (the crushed stone underneath) need fixing. If a rail is cracked or worn, special machines or crews cut out the damaged section and replace it with a new piece, welding it in place and grinding it smooth so train