The Mary Ann is a replica of the first steam engine built in Queensland in 1873 at John Walker and Co's Union Foundry.

It steams through the park along the rail tracks which were laid to service the wharves and Walker's Foundry. The Mary Ann now operates from 9:30am - 12pm every Saturday. It also runs during those hours on the second Thursday of the month, and the last Sunday of the month.

The Whistle Stop Railway Museum is open Monday to Thursday from 9am - 12:30pm.