It's a caboose, so that finally you can satisfy that 5-man crew requirement.
Capacity: One brakeman and two trainmen.
Running costs: about 2/3 of a locomotive, because you're paying those union-negotiated wages.
FAQ
Why should I use these? To provide the other three men who can't fit in the locomotive cab a place to stay.
Why is the running cost so high? Ask the Brotherhood of Locomotive Engineers and Trainmen.
What is the point of this? The FRA mandated five man crews on long-haul freights until the 1970s or 80s. If you don't provide the crew with decent accommodations, they'll probably strike, and you'll be out of compliance and fined. Capisce?
Why is it so small? Cabeese were usually built for the smallest loading gauge applicable. Also I think the default goods wagons are way overscale, throwing it off further.
Probably could release this tomorrow. Don't want to stay up too late tonight, got a job interview in the morning...