Queensland State Archives posted a photo:
Emerald is a town in the Central Highlands Region, Queensland. It lies on the Nogoa River, a tributary of the Fitzroy River. The town lies almost 300 km from the coast and approximately 270 km west of the city of Rockhampton on the junction of the Capricorn and Gregory highways. The Tropic of Capricorn intersects the Gregory Highway just north of Emerald.
The area was originally owned by Aboriginal groups (for example, the Gayiri) for tens of thousands of years before European colonisation in the nineteenth century. The first European to explore the area was Ludwig Leichhardt between 1843 and 1845.
Emerald was established in 1879 as a base for the Central railway line from Rockhampton. It was one of the two largest towns in Queensland which were established as a result of being made the site of a railway station, rather than the railway being built