What is if there are two railroad tracks next to each other?

If there are two railroad tracks next to each other, it means that trains can run in both directions at the same time. This type of setup is commonly used in high traffic areas where multiple trains need to run simultaneously. The distance between the tracks is typically standardized at 4 feet and 8.5 inches (1.435 meters) to allow for safe passage of trains on each track. It is important for the tracks to be maintained regularly to ensure that they are safe and reliable, as any issues with one track can cause delays or even accidents. Additionally, trains must adhere to strict safety protocols when running on parallel tracks to avoid collisions or derailments.