HS2, or High Speed 2, is a major railway project in the United Kingdom aimed at improving train travel between major cities. It will connect London with Birmingham, Manchester, and Leeds, significantly reducing travel times and increasing capacity on existing rail lines. The project is designed to support economic growth and reduce congestion on roads and traditional rail services. HS2 will feature modern trains that can travel at speeds of up to 250 miles per hour, making it one of the fastest rail systems in Europe.