Taiwan Railway Administration purchased five GA18 locomotives in 1969[1] which were equipped with special cab signal display and track sorting devices for use as Qidu hump yard switching locomotives. They were named the S400 series by the TRA. In addition to yard switching, the TRA S400 series GA18's were also used to pull short run commuter trains.[4]
After the closing of Qidu hump yard, the S400 series were used as general road switchers until their retirement.
All have been scrapped with the exception of S405 which has been preserved and restored in its original blue paint scheme, and S402 which is currently stored in a half-dismantled state, Currently awaiting scrapping as it's nearly impossible to restore. Both locomotives are located in Taipei Railway Workshop
