I was impressed by the Japanese stations that had markings on the platform to show exactly where the doors will be for a particular train. People would queue on

I was impressed by the Japanese stations that had markings on the platform to show exactly where the doors will be for a particular train. People would queue on these markings and the trains would glide to a halt exactly in the right space. I believe they also vary the door positions for different routes, so you can have people queuing for two separate trains on the same platform without any confusion or disruption.