electric ship "Strathnaver"

The reference to "electric" presumably means diesel-electric, which in 1931, the year Strathnaver was launched by P&O, was new technology. Initially, Strathnaver had the RMS prefix for Royal Mail Ship, later this was changed to SS.  Strathnaver was the first of a series of Strath class ocean liners built in the 1930s by the Vickers-Armstrong shipyard, in Barrow-in-Furness, then in Lancashire. Strathnaver was the sister ship of the RMS Strathaird and the two became known as The White Sisters, being the first P&O liners to be painted with white hulls and yellow funnels,

Two further Strath class ships, slightly larger and with only one funnel, the Strathmore and the Stratheden, joined Strathaird and Strathnaver on the Sydney run from the mid 1930s. A fifth ship, the Strathallan, was completed in 1938, requisitioned as a troopship a year later, and sunk in the Mediterranean in 1942 taking troops to the landings in North Africa, though with more than 5,000 people on board, casualties are thought to have numbered only a dozen or so. Increasing unreliability of the older pair of Strath liners led P&O to replace them both with the SS Canberra.