The Beijing Subway's second loop route, Line 10, will be completed in May, its construction company announced on April 2.

After nearly 12 months of construction, the main building of the Fengtai Railway Station is finished and being decorated. Niwa Station is also near completion.

The stations will link the first and second phase of Line 10, which runs 57 km and has 25 stations.

Sun Jing, a senior engineer for Beijing MTR Construction Administration Co, said that starting on Monday, trains on Line 10 will run the entire circular route at night, when the subway is closed.

"Line 10 will prepare itself for full circular operation in May, but the exact date for the line's full operation will be decided by the government," company Vice-President Sun Xibo said.