of
Asturias in Brazil in the later 1930s, after conversion to a steam turbine ship and with her funnels increased in height In 1931 the
Royal Mail Case resulted in the jailing of Lord Kylsant, and in 1932 the company was reconstituted as a new body, Royal Mail Lines, chaired by
Lord Essendon. He claimed that German, Italian and French competitors were running ships to South America at , giving a passage about five days quicker than RMSP. The new RML company immediately considered how to raise the speed of
Asturias and
Alcantara. Essendon concluded that foreign competitors were losing money at 22 knots, but a range of options to raise the speed of
Asturias and
Alcantara to should be evaluated. Essendon also proposed inviting foreign competitors to agree on a 19-knot speed limit on the South American route, so that all companies could economise on fuel and attempt to cover their costs. At that time marine diesel power was at a relatively early stage of development, and RML considered it unable to increase the two ships' speed to the required level. Lord Essendon therefore recommended
steam turbines, and two options for the drive system: either conventional reduction gearing, or the newer
turbo-electric transmission that had been pioneered in the US and successfully applied to US, UK and French ocean liners. Whichever transmission was chosen, the cost of re-engining
Asturias and
Alcantara was estimated at £500,000. Lord Essendon also urged RML directors to order a third ship of similar speed to share the route with
Asturias and
Alcantara. Given the
Great Depression at the time, the RML board rejected the idea of a new ship. At first it was prepared to have only one ship re-engined, and proposed reassigning the other to
cruising to replace the ageing A-series liner . However, in May 1933 the board consented to have both
Asturias and
Alcantara re-engined, and at the same time to lengthen their bows by and improve some of the accommodation. RML awarded the work to Harland and Wolff, but with a condition in the contract that the ships must achieve at least , and a graduated penalty clause in case the actual speed increase should fall short of that figure. In the same year, Lord Essendon succeeded in getting RML's competitors to accept a 19-knot speed limit on the South American route. Harland and Wolff fitted each ship with three water tube boilers supplying
superheated steam at 435
lbf/in2 to a set of six turbines that drove her twin propeller shafts by single reduction gearing. The
National Physical Laboratory helped the shipyard to design new
aerofoil-section
manganese bronze three-bladed
propellers, and the rudders were also streamlined. The new machinery succeeded in increasing each ship's
nominal horsepower by 25% and increased their speed to about . Each ships had two funnels, of which the forward one was a dummy. As built the funnels were low, which was a fashion for some 1920s and '30s motor ships. When the ships were re-engined in 1934 each funnel was increased in height. The improvement to passenger accommodation was on "C" deck. A large number of small cabins was replaced with a smaller number of more spacious ones. As revised, "C" deck on each ship had 61 cabins, 47 of which were given
en suite bathrooms.
Asturias was converted first, going to Belfast in May 1934 and returning to service in October. Only after
Asturias had successfully completed a voyage from Southampton to Rio de Janeiro and back did RMS send
Alcantara to Harland and Wolff at Belfast in November. She returned to service in May 1935. ==Second World War service==