Carlos Llamas from the Antonito shops sent me an email which might give some indication of the planned order of restoration of the locomotives: (this is a portion of the email)
.. we are working at the moment on 484, 487 and 488.... then 489 will come in for repair... but thanks to stricter gov. standards... 497 more than likely will not come back into service, she may... have to be retired! But we are looking at plans to resurrect and restore 483 into service and 492 also.. 463 is a project in the plans, but we hope to bring her back into service also..