Altaria trains are composed of locomotive-hauled Talgo coaching stock equipped with gauge-changing technology which enables the carriages to run on both conventional () track and the narrower international  track which is used for the newer high-speed network in Spain.
Altaria trains consist of locomotive-hauled Talgo passenger cars equipped with gauge-changing technology that allows carriages to operate on both standard () tracks and the narrower international track used by the high-speed network in Spain.