There are mixed pedestrian/vehicle underpasses for the Yamanote train tracks in Tokyo as well, though a bit taller (1.5m).
My understanding is that when the tracks were originally put in they were near the edge of the bay so there were still boats. However, as Tokyo expanded and the land filled in the boat tunnels were filled as well and became pedestrian and vehicle underpasses.
My understanding is that when the tracks were originally put in they were near the edge of the bay so there were still boats. However, as Tokyo expanded and the land filled in the boat tunnels were filled as well and became pedestrian and vehicle underpasses.
https://thetokyofiles.com/2013/06/30/sengakuji_underpass/