A well-known example is "die/das Tram" (rather a Helvetism; this words means the same as in English; the more usual German word is "die Straßenbahn). In Standard German, "Tram" is considered as an abbreviation of "die Trambahn" - so it is female. In South Germany and Switzerland, "das Tram" is used.
https://infothek.rotkel.de/rechtschreibung/genus.html
A well-known example is "die/das Tram" (rather a Helvetism; this words means the same as in English; the more usual German word is "die Straßenbahn). In Standard German, "Tram" is considered as an abbreviation of "die Trambahn" - so it is female. In South Germany and Switzerland, "das Tram" is used.