PT Reska Multi Usaha, also known as KAI Services, is a subsidiary of PT Kereta Api Indonesia (Persero) established in 2003. The company's primary goal is to support and implement the policies and programs of PT Kereta Api Indonesia, especially in the railway restaurant business and other related services.
The company operates in three core business areas: On Board Services, Integrated Facility Management, and Commercial Services. On Board Services include sales on trains, train cleaning, and passenger amenities. Integrated Facility Management encompasses security, parking, cleaning services, and outsourcing. Commercial Services include restaurants, general services, cafes, and catering.
The origins of PT Reska Multi Usaha date back to the Dutch colonial era when the government provided railway restaurants to cater to passengers' needs during their journeys. In 1971, during the early days of PT Kereta Api Indonesia, a dedicated unit called RESTORKA was established to manage railway restaurants. Initially, RESTORKA offered simple beverages like "Es Siripit," but it expanded its menu over time, including the famous "Nasi Goreng Parahyangan" when the KA Parahyangan train was launched.

PT Agincourt Resources (PTAR) specialises in gold and silver exploration, mining, and processing at the Martabe Gold Mine in South Tapanuli, North Sumatra. PTAR is headquartered in Jakarta and employs over 3,000 workers as of 2024, with more than 99% being Indonesian citizens and over 70% recruited locally. Committed to safe, sustainable operations, PTAR prioritises minimising environmental impact while delivering long-term benefits to local stakeholders.
The Martabe Gold Mine, located in South Tapanuli Regency, North Sumatra, operates across 646.08 hectares as of December 2024. Since production began on 24 July 2012, the mine has processed over 6 million tonnes of ore annually, producing more than 200,000 ounces of gold and 1-2 million ounces of silver annually.

PT Kalimantan Prima Persada, often referred to as KPP Mining, is a leading mining services company in Indonesia and a key subsidiary within the Astra Heavy Equipment, Mining, Construction, and Energy (AHEMCE) group. Established in 2003, the company has developed a strong reputation for delivering integrated mining solutions across various regions in Indonesia, particularly in coal mining. Its headquarters are located in East Jakarta, and its operational footprint spans North, East, and South Kalimantan, where it manages large-scale mining projects.

Mubadala Energy, a wholly owned subsidiary of Mubadala Investment Company of Abu Dhabi, has become a prominent upstream oil and gas operator in Indonesia. The company’s strategic focus on Southeast Asia is evident in its substantial investment and operational footprint across several offshore blocks in the country. Indonesia represents a core part of Mubadala Energy’s global portfolio, which spans multiple continents and includes assets in the Middle East, North Africa, Central Asia, and Southeast Asia. In Indonesia, the company has positioned itself as a leading player in offshore exploration, particularly in the North Sumatra basin and the Makassar Strait.

PT Saptaindra Sejati (SIS) is one of Indonesia’s leading mining contractors, specializing in coal mining services. As a subsidiary of PT Alamtri Resources Indonesia Tbk (formerly known as PT Adaro Energy Indonesia Tbk), SIS plays a crucial role in supporting Adaro’s mining operations by providing a broad range of services, including contract mining, civil works, infrastructure development, and land logistics. Over the years, SIS has developed a strong reputation for its expertise, efficiency, and commitment to safety in the mining industry.
SIS was established to meet the growing demand for reliable mining services in Indonesia. With its headquarters in Jakarta, the company operates across various mining sites throughout the country. SIS has continuously expanded its operations, investing in advanced technologies, modern equipment, and workforce training to ensure optimal efficiency in coal extraction. Through strategic planning and engineering solutions, SIS has contributed significantly to Indonesia’s coal industry, ensuring the smooth transportation and production of coal for domestic and international markets.

PT United Tractors Tbk, a subsidiary of PT Astra International Tbk, is Indonesia's largest provider of construction machinery and heavy equipment. The company specializes in mining contractors, industrial construction, and energy sectors. United Tractors is known for distributing world-renowned brands such as Komatsu, Scania, Bomag, UD Trucks, and Tadano.
The company operates through five main business pillars: construction machinery, mining contractors, mining, industrial construction, and energy. United Tractors is committed to sustainability and has implemented various green initiatives, including solar photovoltaic systems and green building designs. The company also invests in renewable energy projects, such as mini hydro power plants.

PT Adaro Logistics is a key subsidiary within the Adaro Energy Group, tasked with managing and optimizing the logistics operations that support the group’s vertically integrated coal supply chain. Its establishment reflects Adaro’s strategic commitment to ensuring operational excellence and supply reliability across its business segments. By overseeing the movement of coal from pit to port and ultimately to customers, PT Adaro Logistics plays a central role in maintaining the efficiency and consistency of Adaro’s energy delivery system.

PT Reska Multi Usaha, also known as KAI Services, is a subsidiary of PT Kereta Api Indonesia (Persero) established in 2003. The company's primary goal is to support and implement the policies and programs of PT Kereta Api Indonesia, especially in the railway restaurant business and other related services.
The company operates in three core business areas: On Board Services, Integrated Facility Management, and Commercial Services. On Board Services include sales on trains, train cleaning, and passenger amenities. Integrated Facility Management encompasses security, parking, cleaning services, and outsourcing. Commercial Services include restaurants, general services, cafes, and catering.
The origins of PT Reska Multi Usaha date back to the Dutch colonial era when the government provided railway restaurants to cater to passengers' needs during their journeys. In 1971, during the early days of PT Kereta Api Indonesia, a dedicated unit called RESTORKA was established to manage railway restaurants. Initially, RESTORKA offered simple beverages like "Es Siripit," but it expanded its menu over time, including the famous "Nasi Goreng Parahyangan" when the KA Parahyangan train was launched.