The message
from "Mark & Mel" contains these words:

What is the best thing to preserve UK railway sleepers (I'm not sure of the
wood), the sleepers in question will be sunk in to the ground and others
used as soil retainers.

Is it as simple as putting creosote on and maybe using some sort of vapour
barrier between the soil and sleeper?

Many thanks in advance,

They have already been treated with high-pressure tar/creosote, etc, and
you needn't thing of trying to improve on that: they were meant to be in
contact with soil.

You could line the soil side with black polythene, but the sleepers will
probably outlast you anyway.

--
Rusty
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