Transport between India and Bangladesh two governments moved slowly on implementing a 1980 agreement on improving transport links. In the 1990s, the Indian and Bangladeshi governments collaborated to open bus services between Kolkata, the capital of West Bengal and one of the largest cities in India, and Dhaka, the capital and largest city of Bangladesh. In 2001, another bus service was launched to connect Dhaka with Agartala, the capital of the Indian state of Tripura the second largest city of Northeast India that borders Bangladesh in the east. Since the 1980s, the Indian and Bangladeshi governments have sought to negotiate an agreement permitting commercial vehicles
Geography of West Bengal at places. West Bengal stands third in the country in terms of mineral production. The state contributes about one-fifth to the total production of minerals in the country. Coal constitutes 99% of the minerals extracted in West Bengal; fireclay, china clay, limestone, copper, iron, wolfram, manganese and dolomite are mined in small quantities. There are good possibilities of obtaining mineral oil and natural gas in the areas near the Bay of Bengal, in Purba Medinipur, Sundarbans, South 24 Parganas and North Bengal plains. Research is ongoing in various places to locate natural gas. West Bengal is the third largest state