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#928
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Ment
Something seems a bit unconventional. 40 cm is a very small distance; if it were transportation, any error in cost (tickets, consumption, and fuel price, horse feed) would result in distances much greater than these forty centimeters. I think the essence lies in something else.
The upper shelf, due to the Earth's sphericity, describes a longer trajectory than the lower one. This is noticeable, of course, only at large distances. That's why they travel to Moscow from Omsk, and not from some Ryazan... :D And discounts on upper berths are indeed not uncommon.

Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.

(Закон сохранения).