Ok, it is interesting that the top of 12h clocks in those countries is often a 12 instead of a zero [0]. Maybe the tension of a cardinal zero in an ordinal world (i.e. 1900 is the 20th century) lead the Swiss Railway to de-number the 12h clock [1].

0. https://commons.wikimedia.org/wiki/File:Gare_de_Lyon_xCRW_13...

1. https://en.wikipedia.org/wiki/Swiss_railway_clock