Rail and road links connecting North East India to the rest of the country passed through East Bengal territory. The lines connecting Siliguri in North Bengal to Kolkata and Assam to Chittagong were severed. The whole Assam Railway was cut off from the rest of the Indian system. Those lines carried almost all freight traffic from those regions. The most important commodities were tea and timber. The tea industry in Assam depended on the Chittagong Port to export its produce and import raw materials for the industry such as coal, which was used as the fuel to dry the tea leaves. The industry was severely hit, as Chittagong went to Pakistan. Initially, India and Pakistan reached an agreement to allow cross-border transit traffic, but India now had to pay a tariff. By 1950, India had reconnected Assam to the rest of the country's rail network by building a 229 km meter gauge rail link through the Siliguri Corridor, but now the Tea chests from Assam's gardens would have to be carried over a much longer distance to reach the Port of Kolkata. Exporting tea via the nearby Chittagong port was still an option, but after the Indo-Pakistani War of 1965, all transit traffic was switched off by Pakistan.
