Khulna–Mongla Port line is a 65-kilometre long broad gauge railway to connect the country with Mongla Port. The Rupsha Rail Bridge is located on this route. From Wikipedia
Projects include a historic rail link providing the first connection from India’s northeastern states to Bangladesh, a rail line connecting the second largest port in Bangladesh, Khulna-Mongla, to promote regional trade, and a super thermal power plant to address Bangladesh's growing energy needs.