The megaproject plan has already been passed by the House of Representatives and the Senate. It can be submitted for royal endorsement as soon as the Constitution Court rules on its legality.
If the legislation is deemed legal by the court then the decision on whether to forward the bill for endorsement falls into the hands of the next government, he said.
The Democrat Party petitioned the court to investigate whether the loan bill violates the constitution in November, which prevented Prime Minister Yingluck Shinawatra from submitting the legislation for Royal endorsement straight after it was passed by both chambers of parliament. The opposition asked the court to vet the legislation on grounds that the scale of off-budget borrowing proposed by the bill is unlawful.
Cabinet secretary-general Ampon Kitti-ampon said the interim government could immediately send the bill for Royal endorsement if the Constitution Court rules that it is lawful before the general election, scheduled for Feb 2 2014.
The bill aims to improve the country's transport infrastructure and includes plans to build high-speed trains and double-track railways.