Afternoon all, I have an old photo to share, from Port Kembla, in 2013, it is as follows
X101 Shunting Tractor stands at the Loco Depot, just near the station, I am not too sure about these units, but I believe this one, and X102, spent sometime on the North Coast of N.S.W
Sadly, although X101 and X102 did spend their early life on the North Coast, the illustrated locomotive is not X101 but X212, a much larger and more powerful locomotive.
Some time late in 1994, a rail tractor was needed at the Port Kembla wagon repair depot. X101 was available but not quite up to the job. Also in Port Kembla was X212, a more powerful unit that would be suitable. Sadly X212 had been written off and no money could be spent on it. So a subterfuge was adopted. X101, then carrying the green and yellow scheme from Delec, got a quick coat of Freight Rail blue and the number X212 was applied, while X212 was also repainted blue appearing as X101.
The "new" X101 got the required repairs and appeared at the wagon repair depot, while the new smaller X212 in its new paint appeared in a line next to the station (not far from where X101 is in your photo).
Subsequently the unit numbered X212 was removed for preservation and got its original number X101 back.
The real X212, however still carries the swapped number at Port Kembla.
A number of X200 series were renumbered in the X100 series when the Westinghouse train brake system was removed leaving only the independent brake, which allowed operation by traffic staff rather than loco crew. However, all of these kept the last two digits of their original number. X201, however had a different style of body to the present "X101" so that was not the reason for the new number.