I don’t know what accents you mean because Bahn does absolutely not sound like “ban” or the German “Bann”. The German word “Bann” is spoken with a fast A vowel. The word “Bahn” on the other hand is spoken with a long stretched A vowel instead, so it’s very much the polar opposite.
-bahn sounds the same way that the English word “ban” would with some accents.
I don’t know what accents you mean because Bahn does absolutely not sound like “ban” or the German “Bann”. The German word “Bann” is spoken with a fast A vowel. The word “Bahn” on the other hand is spoken with a long stretched A vowel instead, so it’s very much the polar opposite.
Which accents? Curious.