reballasts

Verb

reballast (third-person singular simple present reballasts, present participle reballasting, simple past and past participle reballasted)

1. 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.1979 August, Michael Harris, “A line for all reasons: the North Yorkshire Moors Railway”, in Railway World, page 412