Re: [Vehicles] Marine Steam Engines
The water capacity of railway engines was also an important factor. In 1941 the Germans discovered that the water capacity of Soviet steam engines was much greater than that of German equipment, forcing the Germans to not only change the rail gauge but build a new set of water towers on the Soviet railways which they were using. They also, of course, became targets for Soviet partisans. {From the book "Engines of War")
Also, "lagging", or the insulation of engine components (against heat loss) improved significantly between c. 1880 and 1920, improving the fuel efficiency of triple expansion engines considerably. See D.K. Brown's series on marine design and construction.
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