Retaining Walls is a structure that prevents the falling of already existing or dumped Loose products while the tile behind it is excavated or dumped on.
It exists in 5 variants with with different footprints: (1x2, 2x2 and 2x4):
|Retaining Wall (Short)||1x2|
|Retaining Wall (Corner)||2x2|
|Retaining Wall (Cross)|
|Retaining Wall (Tee)|
|Retaining Wall (Long)||2x4|
Retaining wall can be built with different levels of submersion to the ground. On perfectly flat ground theres 6 different levels of submersion, on steep slopes there can be none.
Retaining walls, as other buildings (with the exception of pipes?), will start to take damage as any of it's 8 foundation tiles is lowered below the bottom or risen above top of its 3D model.
Retaining Wall (Long) is exactly the length of a mining/dumping tile, which is 4x4.
Using the "toggle_terrain_designations_over_entities" console command will allow the user place mining / dumping designation onto the same tile as the retaining wall. A demonstration of this can be found here: https://www.youtube.com/watch?v=KtdFC6bjJ98&t=943s