KA Commuter Line Supas

The Commuter Line Supas is a prominent regional passenger rail service operated by Kereta Api Indonesia (KAI) and managed under its Commuter Line and local train division. The name "Supas" is a localized portmanteau derived from Surabaya and Pasuruan, reflecting the historical core of its route before its ultimate extension. Today, the service functions as a vital mobility backbone connecting the metropolitan hub of Surabaya Kota to the regional agricultural and industrial center of Probolinggo.

Beyond merely linking major urban nodes, the service carries immense significance for daily passenger mobility, supporting commuters, students, and regional commerce across East Java. The fleet relies on dependable diesel-electric locomotives hauling configuration-consistent passenger coaches, ensuring high reliability despite challenging coastal and tropical operating environments. By bridging provincial centers with secondary towns, the corridor stimulates local economic activity and alleviates roadway congestion across the dense eastern corridors of Java.

The service operates 8 scheduled trips under the current national rail timetable framework (Gapeka 2025), seamlessly connecting 10 scheduled stations along its alignment. Spanning a total route distance of approximately 83 kilometers, the service maintains an average transit time of 2 hours and 13 minutes from terminus to terminus. Rolling stock configuration is designated as Economy Class with Public Service Obligation (PSO) status, making essential intercity and regional transit financially accessible to the general public while maintaining consistent service standards.