During the times I have been in Japan I have noticed two common types of retaining walls along side the railroad tracks. On the Hot Springs Junction Ntrak module, the Ntrak lines will be passing through the module through a cut in the hills and I wanted to model both types of retaining walls on this part of the module.
I have never gotten any good first hand photos of these walls but searching on the internet I did find a couple that illustrate both types.
Some of these walls can be quite high. In this photo, I am making a wall 30 feet tall. To get a good 45 degree angle I first use a sharp pencil to mark the path of the cut on the existing tile seams as shown in this photo. For long sections, these cut tile sheets are spliced together by laminating them with plain .020 sheets.
The plan is to build these in large sections that will fit into a particular spot on the module and then paint with with the airbrush before actually installing them.