Since service disruptions started plaguing Singapore’s subway operator in December 2011, shares of SMRT Corp. have declined about 4 percent, compared with a 91 percent rally in the stock of regional peer, Hong Kong’s MTR Corp. Last week, SMRT agreed to transfer all its operating assets, including trains and signaling systems, to the city-state’s regulator. State investment firm Temasek Holdings Pte., which owns 54 percent of the operator, is considering buying out the rest it doesn’t hold, a person with knowledge of the matter said Monday.

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