The railway came to Hamilton in the 1870s long before the Art Deco period but obviously something happened in that interwar period and they built a new entrance to the station.
Perhaps they built a whole new facade. When I explored around the corner of the building, the side was constructed from weatherboard so perhaps a new concrete or rendered front was put onto the old wooden station.
The trains no longer stop at Hamilton but the large station building is used for buses and coaches.
Wikipedia - Hamilton Railway Station