State government data revealed during budget estimates showed $28.3 million was shelled out on overtime pay last financial year.
Mr Bailey said that number was expected to drop to $24.3 million in 2020-21,as the state had invested in training more drivers.
Spread across the state's 887 drivers,guards and trainees,each worker would have taken home an extra $31,905 on average in overtime last year.
That was expected to decrease to $27,395 this financial year.
Queensland Rail has been under pressure to cut down on overtime hours after the opening of the Redcliffe Peninsula Line sparked a crisis in October 2016,which uncovered a shortage of drivers and an unsustainable reliance on overtime.
The resulting crunch led to the sudden cancellation of hundreds of services,including onChristmas Day,before Queensland Rail cut 462 services under a new timetable in an attempt to restore reliability.
An inquiry launched in the wake of the saga made 36 recommendations,32 of which have been completed.