Just tested the railroad bridge and it works
But I also noticed other problems
1.The 2 warehouses at the respawn point in the south, tanks and infantry can pass through directly
2.The northern respawn point wading up to the opposite bank, near the exit, the AI ​​is often stuck there, and the rock on the right side of the exit can pass through

love the map design. ran into an issue with player slot 1 on the top side where buildings could only be built way away from HQ. and while playing as US, the specialization upgrade building is built into rocks and those units get stuck in the rocks

@pps12330 ty for providing feedback!
i made a fix for that bridge. still trying to figure out how to remove those red lines on the ground

Railway bridge, infantry cannot cross