The first train began running on the North South Line, on 16 April 2017. Until 27 May 2018, the trains only ran on the North South Line and the new Tuas West Extension of the East West Line, where the new train signalling system was turned on. This is because these new trains were installed with only new signalling system, and the rest of the East West Line did not have the new signalling system turned on yet. From 28 May 2018, these trains are now able to run on the East West Line. All 45 trains are currently running, and most of them are housed in Tuas depot.