Using Railway Sleepers on tiered raised vegetable beds
We are in the process of converting a rather 'empty' slope in our garden which is approx 8m wide and 4m deep into 2 raised vegetable beds. We have bought some old Railway Sleepers to hold back the soil which will eventually be placed in there (we have dug it all out).
Please can you advise how to secure the Railway Sleepers in place? Also if the Railway Sleepers are treated is this contraindicated to growing veg next to them?