Retaining sleeper walls...DD: Before and after pix of creative outdoor living ideas many for small spaces.
Sleeper retaining walls and pavior capped steps
wood retaining walls | ... Wall , Pine Sleeper Wall , Retaining Wall , West Coast Retaining Wall Looks great - one for when I win the lottery!
Tranquil Earth - Building Gardens with Railway Sleepers
railway sleepers furniture - Google Search
Bench, steps & raised bed made of railway sleepers. Fairly plain layout but useful for ideas. Might need anti-slip coating for wet-weather. Like the bench to the right (mostly out of picture).
Railway Sleepers - New Soft Wood « Landscape & Builders Merchants
How to build a retaining wall with railway sleepers?
Steps and planters in retaining wall