According to the Bangkok Post a year ago the SRT cumulative debt was 230 Billion baht which has yet to be repaid. It seems as though the SRT wants to increase the network by 75%, buy new railway rolling stock. engines, carriages, probably new freight rolling stock, all made in Thailand.
All this is a great idea and a wonderful plan.
The big question is where will the money come from, firstly to pay off the existing debt, secondly and thirdly to pay for all the new staff that will be be required to run the new network.