This document contains information about subway lines operated by SMRT in South Korea. It includes:
1. A table showing the details of 9 subway lines including their opening year, length, number of stations, and operating company.
2. Descriptions of the key components that make up SMRT's subway system including the central control system, station control systems, train control systems, power supply systems, and platform screen doors.
3. An overview of SMRT's newly developed modular construction method for platform screen doors that involves assembling units at the factory and transporting them to stations for quick installation.