This EMU uses components of domestic and foreign production. In the electrical and equipment section, it uses components produced by Toyo Denki Seizo[ja].[6] As for the braking system, it uses components produced by Nabtesco.[7][8]
The iE305 series has a formation of 12 cars on each trainset.[9]
History
KAI Commuter and PT INKA signed a contract for the production of 16 trainsets or 192 units of the iE305 series on March 9, 2023.[4] The delivery of the entire iE305 series will be carried out in stages from 2025 to 2027.[10]
The first trainset of the iE305 series was completed in early 2025. From March 10 to March 12, 2025, initial testing was conducted at the INKA factory in Madiun.[9]
On March 17, 2025, the first trainset of the iE305 series was delivered from the INKA factory in Madiun to the Solo Jebres EMU Depot. Just a day before on March 16, 2025, the EMU was for the first time went outside the factory area and was exhibited to journalists at Madiun Station.[9] The Solo Jebres EMU Depot is a EMU Depot owned by the DJKA Railway Maintenance Center and managed by KAI Commuter.[11]
The delivery of each trainset is carried out in two stages, with each stage consisting of six cars and being pulled by a locomotive accompanied by several unmanned passenger cars to assist with braking.
In the afternoon of March 18, 2025, the EMU underwent a short test run around Solo Jebres station. This short test run was carried out for the train driver to adapt to the train controls.[12]
In the early hours of March 19, 2025, the iE305 series for the first time underwent a full speed test at 120 km per hour on the Solo Jebres-Lempuyangan section of the Yogyakarta Line. Later in the afternoon, the test run continued on the Solo Jebres-Klaten section.[12] The test run was carried out by INKA, KAI Commuter and PT Surveyor Indonesia as consultants.[9]
On April 16, 2025, the first trainset continued its delivery from Solo Jebres Depot to Depok EMU Depot via Purwokerto, following the trial run on the Yogyakarta Line.[8][13]
iE305 series (CLI-225 series) and SFC120-V series (CLI-125 series) on exhibit during an event commemorating the 100th anniversary of the first railway electrification in Indonesia.
On April 21, 2025, along with the SFC120-V series, the iE305 series was sent from Depok EMU Depot to Manggarai Station in preparation for the event commemorating the 100th anniversary of the first railway electrification in Indonesia on the next day. On April 22, 2025, the iE305 series was exhibited at Jakarta Kota Station, alongside the ESS 3200 class, SFC120-V series and various other EMUs.[14]
After previously being exhibited, the first trainset of the iE305 series began to continue its trial run in Jabodetabek. The trial run began on the Bogor Line on Sunday night, April 27, 2025.[15] The trial was conducted by KAI Commuter together with Toyo Denki Seizo[ja] and Nabtesco.[8]
These trials follow the guidelines of the Ministry of Transportation Number 49 of 2023 concerning Standards, Test Procedures, and Certification of the Feasibility of Normal Speed Trains with Self-Driving. The tests consist of Design and Engineering Tests, Static Tests and Dynamics Tests.[16]
Formations
Each trainset of the iE305 series consists of 12 cars. This arrangement includes two driver cabs located on the first car and the twelfth car (the last car). These two cars have no motors and are referred to as trailer cars with driver cabs (Tc).
Meanwhile, the other trains are divided into several types, namely:
M1 and M2: Motor cars.
T1, T2, and T3: Trailer cars.
In general, the standard formation configuration of the iE305 series is arranged as follows:
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