Commuter rails in Surabaya metropolitan area consists of separate commuter-type local train services operated by KAI Commuter in Surabaya, East Java, Indonesia, and its surrounding areas, such as Gresik, Mojokerto, Pasuruan, Sidoarjo and Lamongan with Commuter Line Supas (KA Komuter Supas), Commuter Line Jenggala (KA Komuter Jenggala), Commuter Line Sindro (KA Komuter Sindro), and Commuter Line Blorasura (KA Komuter Blorasura) trains, also Malang and Blitar with Commuter Line Dhoho (KA Komuter Dhoho), Commuter Line Penataran (KA Komuter Penataran), and Commuter Line Tumapel (KA Komuter Tumapel) These trains currently use INKA-built Kereta Rel Diesel Indonesia (KRDI) diesel multiple unit (DMU) for their service.

Besides the aforementioned trains, there are a number of medium-range commuter trains services between Surabaya and several cities/regencies: Between 2009 and 2013, KA Arek Surokerto ([id], Arek Surokerto Train) was operational,[8] serving Surabaya Gubeng station for Mojokerto station and vice versa, and make a stop in each station.

"Arek Surokerto" stands for Angkutan Rakyat Ekonomi Kecil Surabaya-Mojokerto (Small Economy People's Transport Surabaya-Mojokerto).

The train was using INKA-built electro-diesel train as its rolling stock.