Cika wannan jumla: Da farko gwamnatin Portugal ta ba da umarnin a 1930 a matsayin wani ɓangare na sabon shirin gini. Tare da Yarrows, Lisbon Naval Arsenal na Lisbon an zaba don gina jirgi biyu yayin da Yarrows zai samar da shigar da na'urorin fashewa. An kira "Douro" da "Tejo", an sayar da jirgi biyu da aka gina a Lisbon zuwa Colombia kafin a kammala su don amsawa ga
Colombia-Peru War, a matsayin martani ga sayen Peruvian na masu hallaka biyu. Portugal ta umarci wasu jiragen ruwa guda biyu don maye gurbin su. "Douro" an sake masa suna "Caldas" kuma "Tejo" an sake masa suna "Antioquia".