reballast means to renew the ballast under railway track. Lexicurio rates it Rare gem — a strength score of 79 out of 100.
Etymology
From re- + ballast.
verb
- To renew the ballast under railway track.“Another pressing requirement is to reballast the line as at present nearly all of the track is on ash ballast; some 15 years' hard work should see the line on stone ballast.”