Timber Retaining Walls
Generally constructed from railroad cross ties or large wooden timbers, this type of retaining wall is the easiest to build and least durable solution. In years past, when wood cost less, this was also the most affordable type of retaining wall.
Problems with this type of wall include porous access prone to insect, small rodent and even snake infestations. As with any wood exposed to the dirt, rain and sun, cross tie and timber walls will eventually become rotten and fail; the time this takes is greatly dependent upon the climate.