Introduction (2007) The Argo Sindoro was first operated by KAI on 17 March 2007 using train sets with K9 bogies. However, since 2002, both services had been operated with executive-class train sets manufactured by
PT INKA in the 2002 edition. The earlier train sets were reassigned to operate the
Argo Lawu in 2004. Because the Argo Lawu frequently experienced derailments during operation, the train sets were transferred back to the Semarang Poncol Train Depot in 2007, as trains with K9 bogies were not suitable for the central and southern lines of Java, which are steeper and more winding. Since 2007, the Argo Muria I service was renamed Argo Sindoro when it returned to operation using train sets with K9 bogies, a configuration it retained until the sets were refurbished in the early 2010s.
Argo Sindoro (2008-present) At the end of 2018, the Argo Sindoro began operating with a new series of
stainless steel executive trains manufactured by PT INKA and released that same year. The older 2002 executive trains, after being refurbished, were reassigned to support the operation of the Ciremai train. In April 2019, both the Argo Sindoro and Argo Muria returned to service using K9 bogie trains, which had previously been employed on the
Argo Bromo Anggrek. On 1 June 2023 following the enactment of new train travel chart 2023, The Argo Sindoro has now increased to three daily departures, with one departure from
Jakarta in the evening and two departures from
Semarang in the morning and evening. The Argo Sindoro to Semarang now stops at Jatinegara Station, providing an alternative service for the
Jabodetabek. After the six flagship trains such as the
Argo Bromo Anggrek,
Argo Semeru–
Bima,
Argo Lawu–
Argo Dwipangga, and
Taksaka received the latest generation of stainless steel trains made by PT INKA, on 15 June 2025, the Argo Sindoro & Argo Muria officially uses the new generation executive train series made by PT INKA, while the previous series was transferred to the Argo Merbabu. ==List of the Station==