Two options are being considered for the station's location after community feedback supported protecting the showground site.

Detailed railway station design plans are expected to be released after July.

But Castle Hill and Hills Agricultural Society president Peter Gooch, who recently met Transport Minister Gladys Berejiklian, said the northern option could see the Hills Centre station built in the vicinity of the showground's cattle rings.

A number of pavilions would also be affected.

Mr Gooch said this could effectively destroy the integrity and functionality of the showground.

Mr Gooch said a southern option, the show society's preference, would see the station and park-and-ride car park located on the soon-to-be vacated Hills council works depot site.

Admitting it was early days, Mr Gooch said this option could affect the horse arena in the long term and some pavilions during the construction phase, but have the least impact on the showground's integrity overall.

"The main aim of the showground society is to make the community aware of the possibility they may not have a showground in the future and keep the integrity of the showground so it remains functional," Mr Gooch said.

The society's preferred southern option would most likely affect the animal nursery, Country Women's Association kiosk, horticulture, cattle, cats, goats and possibly the poultry pavilions and cattle and dog lawns during the rail line's construction.

But Mr Gooch said it could be a win-win situation where the government would rebuild the facilities to the community and patrons' benefit: they could eventually catch the train to the showground.

"[The release of a second option] is a great win for the community and a credit to the government who have clearly listened to our concerns," Mr Gooch said.

A project team spokesman said both options for the Hills Centre station location were being assessed.