Indian Railways is over 150 years old and is the largest railway system in the world under a single management. It was established in 1851 and saw integration of various state-run railways after independence in 1947. Today it operates over 63,000 km of track carrying over 1.4 crore passengers and 16 lakh tonnes of freight daily. While it aims to provide affordable transportation nationwide, aging infrastructure and lack of funds are ongoing challenges.