switch engine

/S W IH1 CH EH1 N JH AH0 N/
noun
  1. 1

    A switcher or shunter: a railroad locomotive used for shunting.

  2. 2

    (cellular automata) A particular methuselah in Conway's Game of Life that temporarily exhibits glide reflection symmetry while leaving debris behind, allowing for the construction of spaceships, puffers, and rakes.