The rail system uses rolling stock of rapid transit standard and operates high frequency services with minimum headway.

[7] The electrification project continued and on 1 May 1927, all rail lines that surround Batavia has been fully electrified.

It was reported that then-President Sukarno wanted to get rid of anything that would block the view of Monas and Merdeka Square, then still under construction.

[9] PNKA (later PJKA and Perumka) continued importing trains from Japan, South Korea, Belgium and Netherlands until the late 1990s.

Ticket revenues, rolling stock maintenance, and station management was transferred to the newly formed subsidiary, but all operational matters (e.g. scheduling and dispatching), rolling stock, stations and infrastructures remained under KAI responsibility.

[22][23] In May 2022, KAI Commuter announced some changes to the network, marking the first modification of the routing system since 2011 reform.

The modernization project in 2011 introduced 6 integrated lines and 8 services which serve Greater Jakarta.

The network route map is recognized by color code, destination, and since 2020, a station numbering system.

[29] The card has no expiry date and can be used with a minimum credit of Rp 5,000 after KCI introduced fare adjustment machines.

Passengers who don't have enough credit in their KMT can top-up at fare adjustment machines or two-way ticket counters.

Unlike KCI-issued cards which may only be used for public transit systems and station's park-and-ride facilities, these cards may also be used for goods and services payments at selected merchants, gas stations, TransJakarta BRT, selected parking facilities, and toll road payments.

Currently Commuterline accepts Mandiri e-Money,[33] BRIZZI,[33] BNI TapCash,[33] flazz BCA,[34] Bank DKI Jakcard,[35] and Jak Lingko.

[36] Starting from 1 October 2019, Commuterline station gates accept tickets purchased through mobility and e-wallet apps.

It uses QR code displayed by the app on passenger's mobile phone that can be read by scanner attached inside the system.

[38][39] On the other hand, passengers using JakLingko and Gojek must choose their origin and destination before obtaining the ticket, similar to single trip cards.

All the stations have commercial zones of various sizes for operating retail stores, chain shops, and ATM booth.

Domestically made air-conditioned cars produced by Industri Kereta Api (INKA) are no longer in service, although those trains will operate on Solo-Yogya Commuterline in Central Java.

EMU classes mentioned as current/active by KCI on 28 April 2024:[52] The accidents mentioned below involved trains operated by KAI Commuter's predecessor systems, such as ESS (1925-1939), DKA/PNKA/PJKA Jakarta Exploitation (1945-1976), Jabotabek Urban Railway (1976-1999), and Divisi Jabotabek (1999-2011), before the introduction of standard Commuterline service in July 2011 and standard Commuterline routes in December 2011.