Reporter learned from China Railway 25th Bureau Group Co., Ltd, one of construction parts of Guiyang–Guangzhou Railway and Nanning-Guangzhou Railway that the track-laying of the fourth line of Guiyang–Guangzhou Railway and Nanning-Guangzhou Railway has reached to Foshan tunnel exit. So far, the railway from South of Guangzhou to Foshan tunnel with 25 miles has been completed.