IT'S full steam ahead for un upgrade of Gladstone-bound trains.
Queensland Rail is making changes to its Spirit of the Outback long distance train from January.
The M Series carriages on the Spirit of the Outback services are being retired after more than 61 years of service.
The carriages will have their last runs in December before being replaced by the Sunlander.
Queensland Rail customer service acting executive general manager Greg Fill said Queensland Rail would be introduce changes to the Spirit of the Outback service from January 1.
"With the necessary retirement of the M series carriages, we have revised the service offering for customers on the Spirit of Outback services," Mr Fill said.
First class and the economy seat service will be retained but Motorail will no longer operate.