Leaving the Hunter Valley mainline at Antienne is a relatively short branch serving the BHP coal mine at Mt Arthur. Trains serving the loaders at the end of the branch are configured as push pull with a loco at either end.
5003 was on one of batch of 12 GE C40aci locos built by UGL in 2005 for Queensland National (later Aurizon) for their first foray into the Hunter Valley. Weighing in at 176 tonnes the 4000hp 5000 class are the heaviest units at work in the Hunter.
