Satrio ing Pringgodeni
Most rail transport in Indonesia is located on the island of Java, which has two major rail lines that run the length of the island, as well as several connecting lines. The island of Sumatra has three (soon to be four) unconnected railway lines in the northernmost province of Aceh, North Sumatra (the area surrounding Medan, West Sumatra (Padang and its environs), and South Sumatra and Lampung.
Indonesia's railways are operated by the state-owned PT Kereta Api, and the newly-formed PT Kereta Api Jabotabek, operating the commuter lines in the Jakarta metropolitan area. The infrastructure is government-owned, and the companies pay a fee for the usage of the railway lines.
History of Railways in Indonesia (Java, Madura and Sumatra)