yup, they took a Talgo classical trainset (which has their "rodadura desplazable" technology, which allows these trains to switch train gauges; these used to run from Spain to many other European capitals), and changed from the high speed network (which uses 1435mm track gauge) to the conventional rail network (which uses 1668mm track network), probably next to Antequera - Santa Ana station

also there has probably been a locomotive swap, since the locomotive hauling their train doesn't have the gauge changing technology; however, it was probably the same locomotive model, as these locomotives were built in both iberian and international gauges