From Batavia Trams to Whoosh, How Electric Rail Technology Has Transformed Indonesia

For more than a century, Indonesia’s rail transportation has continued to evolve alongside electric technology. What began with electric trams in Batavia in 1899 has grown into KRL for urban mobility, LRT Jabodebek, and the high-speed Whoosh, bringing Indonesian railway technology into an increasingly modern era.

As KAI celebrates its 81st Anniversary, railway technology development continues through the expansion of electrified networks and increased service capacity. These efforts are part of an ongoing response to the growing mobility needs of communities, particularly across the Greater Jakarta metropolitan area.

One of the developments currently being prepared is the expansion of the KRL network. The Bekasi line is planned to be extended from Cikarang to Cikampek, while the southern line will be extended to Cigombong. The electrification expansion is targeted for completion in 2028 and will be carried out gradually to support KRL capacity of up to two million passengers per day.

Indonesia’s electric rail journey itself has a long history. It began with the introduction of electric trams in Batavia, which officially started operating as a new form of mass public transportation on April 10, 1899.

The electric tram fleet was supplied by Dyle et Bacalan of Belgium and operated by Batavia Elektrische Tram Maatschappij (BETM). Its inauguration took place behind Bataviasche Planten En Dierentuin, or Batavia Zoo, in the Cikini, Menteng area, which also became the location of a BETM tram depot equipped with workshop facilities and an electric power generation room.

In its early days, the Batavia electric tram network connected several areas, including Harmoni, Tanah Abang, Menteng, Kramat, Pasar Senen, Pintu Besi, and Batavia Station. Its presence marked one of the earliest milestones in the use of electric technology for rail-based transportation in Indonesia.

The development then continued into the railway system. Following the construction of electrification infrastructure, Indonesia’s first electric train began operating on April 6, 1925, along the Tanjung Priok–Meester Cornelis, or Jatinegara, route. By 1930, full electric train services between Batavia and Buitenzorg, or Jakarta and Bogor, were already in operation.

Following Indonesia’s independence, electric rail technology continued to develop alongside growing cities and changing travel needs. KRL eventually became one of the main modes of urban transportation, particularly across the Greater Jakarta area, playing an increasingly important role in supporting people’s daily mobility.

The growing demand is reflected in the number of railway passengers served. As of August 2026, KAI Group had served 351,602,397 passengers, an increase of 7.09 percent compared with the same period the previous year. The figure highlights the continued growth in demand for railway services, including electrified transportation.

Electric rail technology entered a new chapter in 2023 with the arrival of LRT Jabodebek. Spanning 44.43 kilometers, the service uses Communication Based Train Control (CBTC) signaling technology with Grade of Automation 3 (GoA3), enabling driverless operations.

That same year, Indonesia entered a new era of high-speed rail with Whoosh. Officially inaugurated on October 2, 2023, and commercially operated since October 17, 2023, Whoosh uses CR400AF trainsets with operating speeds of up to 350 km/h, making it the first high-speed railway in Southeast Asia.

From the electric trams that once shaped Batavia to today’s KRL, LRT Jabodebek, and Whoosh, electric rail technology has continued to move forward. Each service plays a different role, from supporting everyday urban journeys to strengthening intercity connectivity.

More than a technological transformation, this long journey reflects how rail transportation continues to adapt to the times. From electric tram systems more than a century ago to high-speed trains reaching 350 km/h, innovation continues to create travel experiences that better respond to the needs of modern society.

As KAI enters its 81st Anniversary, the journey continues through electrification expansion, service improvements, and technological innovation. From one generation to the next, electric technology remains an important part of building a more modern, connected, and increasingly customer-focused railway system in Indonesia.