Electronics is always 100% reliable, right?
- Don't skimp on wiring. It is a job for the life of the railway; you don't want to do it twice.
- 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!
- Make sure that the point motors operate every time. 99% isn't good enough.