There was a bunch of rollingstock and locos that were put up for tender by QR Heritage at the end of last year. Clyde locos 1407, 1450, and 1455 were among them, and these are two of those three. All 3 locos have been acquired by a group in Mackay, who already own 1400. From what I understand - I'm not a part of the group, just going off details in their Facebook group - it is intended to bring 1400 and 1450 back to working order, with the remaining locos serving as spare parts.
For more details:https://www.facebook.com/ClydeGroupQueensland/