In this study, soil samples are used to pedal all the way to seven sources used to construct railways in the country, Thai. One consists of Central North region North East top/bottom. The East and South.
In this study will be used to take samples of soil embankment, all seven of the railway in Thailand. Comprising the Central, North, Northeast, Upper / Lower, East and South.
In this study will be used to use soil embankment all seven source used in the railway construction. It consists of northern region. Northeast upper / lower and upper south.