Patna is served by several railway stations located in different areas of the city. The Patna Junction railway station is the main railway station of the city, and one of the busiest railway stations in India. Patna lies in between New Delhi and Kolkata on Howrah–Delhi main line, which is one of the busiest rail routes in India. Patna Junction is directly connected to most of the major cities in India. The city has four additional major railway stations: Rajendra Nagar Terminal, Patliputra Junction, Danapur and Patna Sahib. Danapur is the divisional headquarters of East Central Railway. Patna is well connected with neighbouring Gaya, Jehanabad, Bihar Sharif, Rajgir, Islampur through daily passenger and express train services. India's second longest road-cum-rail bridge (4.55 km), Digha–Sonpur bridge has been constructed across river Ganges, connecting Digha, Patna to Pahleja Ghat in Sonpur. The bridge was completed in 2015.