Old Helensburgh Railway Station Old Helensburgh Station There is an abandoned train tunnel near Helensburgh Station, 50 km south of Sydney. It was built in the mid-19th century but was closed in 1920 and then used as a mushroom. Class planting area. Later, with the reduction of mushroom cultivation in the tunnel, a large number of blue-light fireflies gathered here, making it one of the largest fireflies in New South Wales. The tunnel mouth is hidden in the jungle bushes, stroking the arched stone wall with a hundred years of history, but looking inside is an unspeakable quiet and deep. This tunnel is 400 meters long and does not require much guts. First, both ends are open and can pass directly. Second, there are many visitors, especially holidays. Fireflies are concentrated in the middle of the road.