Watco and Qube are both power starved of narrow gauge locomotives at the moment. Providing the DCs can be accredited for use on the QR network, they could certainly be found a willing operator. From reports of their time on the Carmichael Rail Network they were remarkable workhorses despite only having four traction motors. Are there any other narrow gauge locomotives for sale overseas that Watco/Qube might look at to overcome the shortage? Cheers.
Together with a low axle load of 13.6-tonnes and short length of 14.01m, the DCs would also make a potential alternative to 1720s as second locos on the Central Line west of Emerald - curvature on the Drummond Range precludes the use of coupled WRAs or WRBs - leaving 1720s as the only alternative for a second locomotive (and probably one of the reasons Watco has just purchased 1723 from QR).
Aurizon sold around 140 narrow gauge Queensland and Western Australian locomotives overseas between 2012 and 2016, most going to Southern Africa, but twelve 2170s also went to Chile for conversion to metre gauge. To date most locomotives repatriated by Watco, One Rail and Progress (leasing to Glencore/Qube) have come from South Africa's Transnet fleet. 11 2250s returned to Australia for One Rail and Progress, and eight 2170s have been returned for Watco (Watco may actually own another three ex-Transnet 2170s still in South Africa, and Progress may also own some of the remaining 14 ex-Transnet 2250s still in South Africa).
Long story short, there's still a lot of Queensland and WA suitable locomotives scattered around Southern and Central Africa, and South America, but their current owners - which includes tourist, freight and lease operators - may not be in a hurry to part with them.