KAI to standardize all commuter trainsets at 12 cars and prepares long-term procurement of 128 trainsets
The operator will phase out SF8 and SF10 formations, add power capacity on the Green Line for 5-minute headways, and turn Nambo line trains into a feeder mini hub at Citayam.
KAI president director Bobby Rasyidin announced on Monday a sweeping change to Jakarta commuter rail operations. All electric train formations will be standardized at twelve cars (SF12), with the current SF8 and SF10 sets retired gradually. The first step is additional traction power substations on the Green Line between Tanah Abang and Rangkasbitung so it can run SF12 sets at five-minute headways. KAI is also preparing the long-term procurement of 128 trainsets to replace aging rolling stock, a pipeline far larger than the 23 trainsets currently being executed.
On the Nambo line, trains will terminate at Citayam, which becomes a new mini hub with feeder connections, cutting Nambo headways from one hour to 30 minutes and freeing capacity on the shared Bogor corridor. The rearchitecture creates new operational demands: crowd management at the untested Citayam transfer point, occupancy data to guide formation migration, and reliability monitoring of older sets during a multi-year transition. No implementation timeline or budget figures were disclosed; the announcement was quoted from the deputy interior minister's social media account, so official confirmation from KAI is still awaited.