 The need to transport commercial produces such as coffee from plantations in the interior of the island to the harbour on the coast spurred the construction of railway networks in Java.Today, industry, business, trade and services flourished in major cities of Java, such as Jakarta, Surabaya, Semarang, and Bandung; while some traditional Sultanate cities such as Yogyakarta, Surakarta, and Cirebon preserved its royal legacy and has become the centre of art, culture and tourism.Industrial estates are also growing in towns on northern coast of Java, especially around Cilegon, Tangerang, Bekasi, Karawang, Gresik and Sidoarjo.