[cityhantam]

There is replacement of mechanical components after 2011 incidents.

But as some issues after signal upgrade in late 2010s. It takes a while to integrate the system properly. 

Thus the delay for full replacement for EW line trains. Most trains are partially upgraded.

.... first section from Yio Chu Kang to Toa Payoh commencing operation on 7 November 1987.

That Kawasaki is the "pioneer" lor! 

It is important to replace such an old train and not wait until disaster like this happens!

Hope those ic in LTA and SMRT wake up to this fact after this incident!

Last time they woke up only after the wooden slippers became so rotten that they had to resort to using plastic fasteners and resulted in more problems! Eventually, Ah Cow got to come in to put things back on track.