Rail bridges are structures designed to support trains as they cross obstacles like rivers, valleys, or roads. They are essential for maintaining efficient transportation networks, allowing trains to travel smoothly and safely over challenging terrains. Rail bridges can be made from various materials, including steel and concrete, and come in different designs, such as beam, arch, and suspension. These bridges are engineered to withstand heavy loads and environmental factors, ensuring durability and safety. Regular inspections and maintenance are crucial to prevent structural issues. Notable examples of rail bridges include the Forth Bridge in Scotland and the Golden Gate Bridge in California, which, while primarily a road bridge, showcases similar engineering principles.