For the expected increase in traffic towards the French border, the Central de Aragón ordered two types of Garratts for express and freight traffic. The locomotives for express service were designed as double Pacifics and were built by Babcock & Wilcox after plans by Beyer, Peacock & Co.

They were the most powerful express locomotives in Europe at the time and at the same time the only Garratts that were used on express trains. When they were incorporated into the RENFE, they became 462-0401 to 0406, whereby the 462 was to be understood as “two times 231”. Between 1955 and 1962 they were converted to oil firing and renamed 462F. Their use on express trains ended in 1966 and they were used in freight transport for another four years. Today only the non-operational 0401 exists.