For the 12km, catch a train to Blacktown Station and catch one of the free shuttle buses running regularly from 5am until 6.30am to get to the start line at Sydney Motorsport Park.
From the finish line at Beames Ave near Angus Park, walk (800m or approx. 10 minutes) to the finish festival to collect your race medal and enjoy the finish festival. From there catch a free shuttle bus available from 8.20am until 1pm leaving from North Pde and this will take you back to Rooty Hill Station.
For more details and to plan your trip, visit https://transportnsw.info/events/2019/03/runwest