Download Subway Metro Station Free Unity.
A very nice and high-quality package containing modular assets that can be used to create A subway station/ subway corridors.
All objects have prefabs with their own materials.
Objects are all low poly and optimized.
All assets are modular And the demo scene that you see has been made up out of only modular assets.
All assets have been set up to work with the PBR metallic/roughness method.