"Every big city has a train station."

Translation: Кожне велике місто має вокзал.

[GeneM.]

Can't кожен be used here?

[deactivated user]

No. Кожен is masculine form, кожна is feminine, кожне is neuter, and кожні is plural.

Since місто is neuter, it should be кожне велике місто.

[Mr.Xee]

Living all my life in Ukraine, I have never heard somebody saying "місто має вокзал". That's an artificial frase, nobody uses it.
"У місті є вокзал" is the only correct and real form.

[RianFinn]

Does У кожного великого мiста є вокзал work?

[RianFinn]

I got the form from https://www.ukrainianlanguage.org.uk/read/unit06/page6-6.htm