Yahoo! News Singapore, 6 Jul 2012City Hall MRT station was hit by a roughly 90-minute power blackout on Friday afternoon.
According to train operator SMRT, the incident occurred at 1:23pm, affecting the power at both its lower level North-South and East-West train platforms.
Train arrival information screens were down, and escalators between floors were also switched off for safety.
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Cityhall now no light and escalator and lift not working - Hardwarezone Forum