The public are welcome at the celebration, which runs from 2pm to 4pm.
Mr Butler said the function would mark the completion of preservation work on the 108-year-old building - a project first mooted about a decade ago.
About $90,000 has been spent on repairing and preserving the station and half of the building has been converted into a satellite office for a cycle tourism business.
The remaining half will be used for a museum featuring railway memorabilia.
Today's function will include free ''tea and scones'' and railway songs will add to the atmosphere.
A scale model of the station and surrounding buildings, made by Clyde man Bob Allen, will be a special feature of the celebrations and it will remain on display in the station permanently.
The building was last used as a station about 35 years ago, when a new railhead was built on the outskirts of the town to serve the Clyde dam traffic.
