Circle Line 1 OT (Full trip to Dhoby Ghaut)

A Circle Line Alstom Metropolis train speeding through the Inner Track tunnel of the Circle Line 1, from Mountbatten to Dhoby Ghaut, which opened on 17th April 2010.
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[@ThomaYeo]

What does OT mean in the title?

[@RockyBroadcast]

Hi, It stands for 'Outer Track', which is the Dhoby Ghaut bound tunnel.

[@ThomaYeo]

I see. Thanks! :)