Subway and Elevated Trains

https://en.wikipedia.org/wiki/Selective_door_operation#Purpose_and_operation_of_SDO

https://en.wikipedia.org/wiki/%C3%98resundst%C3%A5g#Rolling_stock
Three trains per hour in each direction use the Øresund Bridge, increasing to six trains per hour during the rush hour, each train consisting of up to three sets coupled together, creating 237-metre-long trains each with 588 seats, providing a capacity of 1764 (3528) seats per hour. Increasingly this has turned out to be insufficient, and people have to stand during rush hours (into Copenhagen in the morning and Malmö in the afternoon). 
https://en.wikipedia.org/wiki/%C3%98resundst%C3%A5g#Services

https://en.wikipedia.org/wiki/SL_X60#X61

https://en.wikipedia.org/wiki/Stockholm_metro#Rolling_stock

https://sv.wikipedia.org/wiki/Tunnelbaneplan_f%C3%B6r_Stockholm_1965

https://en.wikipedia.org/wiki/Taipei_Metro#Platforms