Up to 12,000 new homes are planned for Sydney's northwest as areas are built up to complement a mammoth rail project.

Three new urban centres will be constructed around Kellyville, Bella Vista and Showground railway stations on the $8.3 billion North West Rail Link. The NSW government says the hubs could create 19,000 jobs and 12,000 additional homes. Public parks, cycle routes and green corridors will also be revamped. The Baird…