China has proved its commitment to Africa over the years with a number of infrastructure projects across the continent. The Chinese-built 480km Mombasa-Nairobi Standard Gauge Railway (SGR) was Kenya's largest ever infrastructure project. The construction of the second phase of the SGR is already underway. China has up to 22,000km of rail track, accounting for 60 percent of the world's total, and is willing to help other countries to build railway networks.