sander

noun4

1. •
   A person employed to sand wood.
2. •
   A machine to mechanize the process of sanding.
3. •
   A device which spreads sand on the rails in wet, snowy, icy, slippery conditions to improve traction.

   • Grass growing on the track made the running far from easy, and only frequent use of the sanders enabled us to breast the 1 in 50 gradients between Letterkenny and Kilmacrenon [sic]. — 1949
4. •
   (historical) A small device resembling a salt shaker but containing sand that was shaken over a document to remove excess ink.