Comments on Emirza Adi Syailendra "The end of the line for Japanese influence in Indonesia", 13/10/2015
This is just one infrastructure project in Asia and it went China's way. Japan needs not to be too disappointed and there will be many projects in Asia that Japan can be a successful bidder, as the high speed rail project in India has showed.
China has as strong the adequate capacity to build safe high speed rails as Japan does. It is reported that the total length of high speed rails in China is as long as the total of all other countries, although I have not checked for its accuracy.
Any concerns of China's capacity to build safe high speed rail would amount speculation.