This petition is to encourage Dreamworld to bring back and continue running the steam locomotives on the Dreamworld railway and remove the diesel replacements. 

From Wikipedia: 

The Dreamworld Express opened with Dreamworld on 15 December 1981 as the Cannonball Express. The Baldwin locomotive was originally used during the First World War in France before being relocated to Queensland for use on the cane fields. A second steam locomotive, a Perry, that had also seen service at a Queensland sugar mill, was purchased and put into service on the railway. Until the late 1990s the railway operated with both steam locomotives in peak periods. The railway then shifted to operations on a rotational basis, with one train being serviced while the other would operate normally. The two locomotives could each tow carriages to cater for up 160 passengers at a time. 

After Easter 2013, Dreamworld began operating the train only on weekends and school holidays. The park subsequently replaced the two steam locomotives with a diesel replacement. The diesel masquerades as a steam locomotive and was built by ride manufacturers C&S in Italy. The ride now operates as the Dreamworld Express.