In his master thesis, Yizhaou Zhang writes about RTCI - real time crowding information. Apparently even in rush hour there are a lot of empty seats on the metro trains, because the crowd is concentrated to specific parts of the train. Zhang tested giving audible and visible information about where the train was crowded at the KTH metro station based on a combination of historical data and observation at the previous metro station.
Zhang found that when this information was provided, people changed their behavior and the front of the train was less crowded. A lot of people thought that the visual information was more useful than the speaker system that was used to provide the audible information.
Zhang discussed different ways of providing the visual information and the challenges of getting the attention of the passengers, and found that the information should be nearby the existing information display.
I think this could be applicable to the commuter trains in Stockholm as well. A lot of people in our interviews complained about the crowded trains, and the commuters often travel for a longer time than metro passengers, so it is helpful for them to have a place to sit.
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