I think i am in the right area.
At the back of our garden is a large hill... with a railway line at the bottom.
The hill starts inside our boundry, levels off on the boundry theen continues down after.
Over the years the ground is falling and the hill has creeped further into the garden.
I am looking into building a retaining wall on the boundry so that we have got our full garden. but am not sure what use. I would be building a wall and fenceline ontop of it.
It would need to be at least two foot tall and about 10 metres across. What is that best desgin/ material for the job.