According to the minister, the high-speed railways would take up 39% of the 2-trillion-baht investment.
The government will spend about 400 billion baht on developing electric railways from Bangkok to nearby provinces.
It will also build double track railways with a combined distance of 2,800 kilometres on five routes including from Bangkok to Nong Khai and to Den Chai district of Phrae province.
Other projects in the transport development scheme include four-lane intercity motorways, customs posts and ports.
Mr Chadchart said the government would allow representatives of the private sector's Anti-Corruption Network to examine the implementation of the loan scheme to ensure transparency.
The government plans to take its public relations campaign to people living near development sites.