UGL Rail C44aci

The first of the Pacific National 92 class was officially launched at Port Waratah on 3 October 2008.[5] All 15 units entered service on coal trains in the Hunter Region and were trialed on Brisbane—Melbourne freights and return.[6][7] In 2012 Pacific National took delivery of six 93 class C44aci locomotives optimised for intermodal freight transport between Melbourne and Brisbane.[8][9] On 17 January 2013, Pacific National placed an order for another two (later expanded to five) 93 class locomotives.[10] In 2014, Pacific National extended the order of the 93 class to 9324 in which all 24 93 class are in service. 9321-24 are commonly seen on Melbourne-Adelaide intermodal services and other east-coast trains while all other examples are run almost exclusively in the Hunter Valley on coal services.[11][12]

In October 2021 it was announced that UGL had secured a $297 million (later $330 million) order for 50 C44aci locomotives from Pacific National, these locomotives are to have GE's newer Evolution series of engine. The locomotives are to be designed and delivered over a period of 7 years, with deliveries starting in 2024. They are to be designated the "94 Class".[13][14][15]

Australian Railroad Group AC4305 at North Dynon in September 2009

No 2 end of QR National 6001 at North Dynon in September 2009

In July 2008, QR National subsidiary Australian Railroad Group ordered eight locomotives, with options for 16 more units. Intended for use on their Western Australian standard gauge lines, they were delivered between August and September 2009.[16] These units feature updated electronic control and engine management systems, and had their entry to service delayed by weight issues, with steel body side doors being replaced with lighter aluminium substitutes.[17] Since entering service they have been used on the Koolyanobbing to Esperance iron ore service, in the full fuel load (139 tonnes) configuration.[17]

In January 2009, QR National ordered twelve 6000 class units for use on coal haulage.[18][19] The first was delivered in October 2009.[20] These units were to be fitted with electronically controlled pneumatic braking equipment, for operation with similarly Hunter Valley Coal wagons.[17][21]

QR National subsequently ordered an additional 12 locomotives specifically to operate its Coal trains. The first nine were delivered in 2012 as the 6020 class with the final three diverted to Australian Railroad Group as the ACC class.[22][23]

Aurizon purchased five new 6040 class units were built in 2017–18.[24]

Aurizon ordered 10 new C44aci locomotives in 2021, numbered ACD 6046–6056. As at 27 December 2022, eight have been delivered. 6046 entered service on 19 March 2022, 6047 on 24 March, 6048 on 23 April, 6049 on 24 April. ACD 6050 entered service on 10 October 2022, and 6051 entered service on 12 October 2022. ACD 6052 entered service on 19 December 2022, ACD 6053 entered service on the 29th December 2022, 6054 on the 27th, and ACD 6055 entered service on the 13th of February 2023. 6055's livery features Australian Aboriginal artwork on the long end.

In 2021, ORA took delivery of GWU012-GWU015, these are now owned by Aurizon and used in South Australia and the Northern Territory.

East Coast Rail comprises the former One Rail Australia's east coast coal operations in Queensland and NSW. In 2022, Genesee & Wyoming Australia took delivery of 11 locomotives for use on Hunter Valley Coal trains services, numbered GWU001-GWU011. They eventually found themselves back in NSW. All 30 of the former Glencore and One Rail Australia XRN class are now owned by East Coast Rail as well, though still wearing the GWA/ORA livery. All are used on Hunter Valley coal trains.

East Coast Rail XRN Class C44aci

In 2012–13, CFCLA took delivery of 12 C44aci locomotives as the CF class, numbered CF4401-CF4412. CF4412 was named Black Caviar and painted in salmon pink, silver and black (which were the racing colours of Black Caviar), as opposed to the standard blue, silver and yellow that CFCLA usually used. In 2016, two (CF4401 & CF4409) were sold to Aurizon, and subsequently being repainted into their 'Canary' scheme, although kept their original numbers. All remaining ten were included in the transfer of assets to Anchorage Capital Partners in January 2020, and subsequent rebranding as Rail First Asset Management in early 2021. Four more were ordered in 2021, and as of 6 June 2022, three were running at UGL Broadmeadow, CF4420 and CF4423. CF4424 Repaint Into Aurizon

In 2012, Centennial Coal took delivery of seven locomotives for their coal operations.[25][26] These are operated by Southern Shorthaul Railroad.

UGL Rail had four units on the production line for Consolidated Rail Leasing as the CRL class before the order was cancelled. They were completed and retained by UGL as lease units. They along with two units completed for but not delivered to Genesee & Wyoming Australia were sold to Mineral Resources as the MRL class. The first entered service in June 2014 hauling iron ore train from Mount Walton to Kwinana.[27][28]

In 2014, three were completed for Fletcher International Exports in attractive red and blue livery to haul the Fletcher's container service from Dubbo to Port Botany. Trains are run by Southern Shorthaul Railroad. A fourth unit (FIE004) was ordered in 2021. In November 2022, it was undergoing outdoor commissioning at UGL Broadmeadow with ACD6052, entering service on 16 November 2022.

PHC001 at Cowan in 2016.

Two locomotives (known as Spud and Carrot) have become the permanent motive power for the Sandgate to Port Botany container train operated by Crawfords Freightlines, replacing the leased C class locomotives as the motive power.[29][30]

QL009 at Jacana in 2022.

Qube announced the purchase of an unspecified number of locomotives in March 2020, for delivery over 18 months.[31] It was later confirmed that 12 locomotives were to be built. As of 9 November 2021, all 12 locomotives are in service. After initially seeing use on QUBE's various trains throughout NSW they now mainly see use on the BlueScope Steel services out of Port Kembla to Melbourne (Long Island) and Brisbane, now that QUBE have taken this contract over from Pacific National from 1 January 2022. In June 2022 QUBE ordered 8 more locomotives. QL013 entered service on the 14th of May 2023 and QL014 entered service on the 24th of May 2023. QL015 entered service on the 6th of June 2023, QL016 on the 27th of June 2023, QL017 entered service on the 30th of June 2023 and QL018 entered service on the 15th of July 2023. QL019 entered service on the 15th of August 2023. As of the 21st of August 2023, QL020 has not yet entered service. QL019 and QL020 wear a predominantly blue Aboriginal design with a map of Australia.