It always returns unless you pull it out by the roots and judging by its slow and steady regrowth near the station that massive pruning and weed removal effort earlier this year missed just a few roots.
Queen Anne's Lace is often a feral weed in Australia and you can see it growing near the railways tracks near Hornsby station and Pretoria Parade. It's a relative of the carrot and is as much a herb as a weed. I suspect since its not a native plant some early colonist brought seeds over from the UK for a herb garden and like so many other plants it went wild.