The Cube (큐브) refers to the latest iteration of the KORAIL Class 312000, forming the 14th Batch (14차분) introduced between 2022 and 2024 for Seoul Subway Line 1. Although KORAIL does not officially classify its EMUs by “generations,” rail enthusiasts commonly group the 311000/312000 series into informal phases based on design and technological evolution. Under this fan-made convention, the Cube is regarded as the fifth generation, distinguished by its angular front-end designed by büro staubach and by its adoption of an aluminum carbody for the first time in the series.
This batch was commissioned to replace the remaining early VVVF-equipped Class 311000 units delivered in the late 1990s, as well as several later batches that had themselves been introduced as replacement stock. As a result, part of the Cube fleet effectively replaces earlier replacements, marking an unusually deep renewal cycle in Line 1’s rolling-stock modernization.
Technologically, the trains employ Woojin IGBT-VVVF traction systems and incorporate several features tailored to the operational demands of Line 1. A double-arm pantograph addresses contact-force instability on aging rigid catenary in underground sections, while an automatic AC/DC switching device (ADS) ensures smooth transition across the corridor’s mixed electrification systems.
Service introduction progressed steadily through 2023 and 2024, with units such as 312B37 entering regular operation in December 2023. Today, the Cube operates across all sectors of Line 1, including the Gyeongbu Line from Cheongnyangni to Sinchang via Suwon, as well as Gyeongin and Gyeongwon local services. Its arrival represents one of the most extensive rolling-stock renewals in the history of Line 1, establishing both the design language and technical benchmark that define the newest phase of the 312000 series.
🚇 Additional Information: Source (Namuwiki)
Suwon Station, Suwon, Gyeonggi, South Korea
Camera: Canon EOS 800D / Rebel T7i / Kiss X9i
Lens: TAMRON SP 28-75mm F/2.8 Di A09E
Capture Information:
Focal Length: 57.0 mm
Shutter Speed: 1/80
Aperture: f/2.8
ISO: 1250
Photo Taken: May 05, 2025
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