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Based on the rest of the information on the image, it appears to be the China National Railway Test Centre in Beijing. In the foreground, the two Romanian CFR 40 locomotives exported to China in 1973 can be seen, which were designated 6G1 in China.
Uploaded a work by ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Bärtschi, Hans-Peter / SIK_03-057329 / CC BY-SA 4.0 from http://doi.org/10.3932/ethz-a-000811296 with UploadWizard