I saw a video a few months back where they went into the terminus room for a pneumatic tube messaging system, and they had rows of tubes, so they apparently had individual tubes running to each station that all ran back to that common room. If I can remember what it was, I'll see if I can dig up a link to it.I don't remember belt operated systems, but I do remember the air operated ones. What I wouldn't be able to figure out was that if there was more than one cashier's station on the sales floor, how would they know which "transport device" to accept back with the change?
The only place I've actually seen those tubes in use (aside from drive-up bank teller windows) was either at Norman Municipal (now Norman Regional) or Children's Hospital, but that would've been over 40 years ago. I didn't even see any remnants of the tube system at Norman Regional the last time I was there, but it has been remodeled and expanded several times since I would've seen the tubes in use.