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Why weren't these a thing more often in the heyday of railroads?
>gives freight trains an additional source of income
>passengers can presumably pay for tickets less since freight trains usually run on slower schedules
>allows for mixed trains without the need to pull a coach from regular passenger service
>can be coupled to the back of a regular passenger train during periods of high demand, the crew will enjoy the added privacy too
>lonely freight train crews will enjoy the additional company
>can be outfitted as extra crew accommodation when not in revenue service
