Electronics is always 100% reliable, right?

  1. Don't skimp on wiring. It is a job for the life of the railway; you don't want to do it twice.
  2. Make sure there are no loose wire strands (e.g. at terminal strips) that could short out. Screw terminal strips ("chocolate blocks") are very good at creating these!
  3. Make sure that the point motors operate every time. 99% isn't good enough.