By the 1850s, Calcutta had two areas: White Town, which was primarily British and centred on Chowringhee and Dalhousie Square; and Black Town, mainly Indian and centred on North Calcutta.[42] The city underwent rapid industrial growth starting in the early 1850s, especially in the textile and jute industries; this encouraged British companies to massively invest in infrastructure projects, which included telegraph connections and Howrah railway station.