The coal transportation comes approximately three months ahead of the schedule, and follows a test train earlier this week.
Whitehaven Coal managing director and CEO Paul Flynn said: "Maules Creek is already having a substantial positive economic impact on local towns, the region more broadly and the state as a whole.
"During construction, the project has provided employment for up to 600 full-time equivalents and contractors."
The Maules Creek project is expected to produce around 2.5 million tons run-of-mine coal (RoM) up to 30 June 2015, and is likely to be declared fully commercial from 1 July the same year.
On commencing full operations, the mine will have a workforce of around 450.
Work on the erection of the coal handling preparation plant, permanent power, product coal stockyards and workshops is underway.
Whitehaven Coal has placed orders for the equipment, to expand production to 8.5 million tons a year RoM coal. The equipment is expected to be received in late 2015.
