The age of industries brought major technological changes, growth of factories and the making of new industrial labour forces. Indian industries grew out of the necessities and as a consequence of the colonial economy. For example, Europeans who invested on cash crops (tea, jute, cotton) and minerals like coal, copper, etc, needed railways. Therefore, steam-run trains were introduced connecting different parts of India. Then, telegraphs were also introduced for communication and security reasons. During the war time, India benefitted by getting some concessions and protection from the government. The industries also diversified in their products especially due to war needs.