Known as ‘Twin Peaks', the property is owned by Peter and Zena Martin, who lived there for 15 years before moving to Agnes Waters for a change of lifestyle.
Mr Martin, who runs a secret mystery shopping company, said the converted train carriage was always a talking point among those who drove past or visited their home.
“I was running my own business from home and started with one bedroom being converted into an office,” Mr Martin said.
“Converting a shed was an enormous amount of money so I found the train carriage online.
“There’s a lot of history to it - it’s an original staff sleeper carriage, number 1471, from Queensland Railways’ The Sunlander (1952) which now sits at the front of the property with privacy hedging.”
Mr Martin said the carriage had top and bottom bunks however the bottom bunks were removed and replaced with custom-made desks.
He said the original bunks were still in storage at the property.
Mr Martin also had a wall cut out within the carriage to make it a meeting room with five offices.