SINGAPORE - SMRT Corp chief executive Desmond Kuek, 52, earned more than $2.25 million last year, according to the company's latest annual report.

The amount is double what he made when he first joined the rail operator in October 2012. For the six months to SMRT's financial year-end in March 2013, Mr Kuek made $611,000, which is equivalent to $1.22 million if annualised.

For the year ended March 2014, he made between $1.75 million and $2 million.

In its latest annual report, the Temasek Holdings-owned transport group said Mr Kuek's remuneration was between $2.25 million and $2.5 million for the last financial year.

This means Mr Kuek's compensation had doubled in less than three years, making him SMRT's highest-paid CEO. His predecessor, Ms Saw Phaik Hwa, made about $1.85 million before she left in 2012.