Two gondolas? Why?
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Vladislav, I think what you see when you saw "two gondolas" is the "tender" and the "canteen". Often tenders were designed to carry enough coal to go twice the distance than the water they carried would last. They theory was it was easier to add water, and easier to have water supplies in more places, so the locomotives stopped twice for water for every one time they stopped for coal. Later for some trips the railroads added canteens, which only held water, and extended the range that the locomotive could go without stopping. A gondola is a type of freight car distinct from a tender or a canteen.
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