siding siding /ˈsaɪdɪŋ/

noun

1. () A short stretch of railroad track used to store rolling stock or enable trains on the same line to pass  ( sidetrack , turnout [ N. American] , railway siding [Canadian, British] , railroad siding [ N. American] , siding )
   a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
   
2. [ N. American] Material applied to the outside of a building to make it weatherproof  ( siding [ N. American] )
   material applied to the outside of a building to make it weatherproof