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Esben Kolind posted a topic in LEGO Train TechHi, At the recent Lego World 2013 in Copenhagen I displayed my model of Islands Brygge Metro Station including NXT controlled sliding platform doors. This model is the fourth in a line of trains with automatic sliding doors, that I have built over the last years (version 1, version 2, version 3). I have compiled a short video to show all the functionality including some "behind the scenes" footage: The NXT controls the following: Output 1: Running the train on the inner loop (9V) Output 2: Running the opening mechanism for the three sets of platform doors and three stes of train doors Output 3: Running the elevator Light sensor: Stopping the train at the platform (accuracy: 1 stud) Distance sensor: Detecting the lower position of the elevator (dynamically calibrating the elevator cycle) Touch sensor: Detecting the outer position of the opening mechanism (dynamically calibrating the cycle) In addition, there is a 9V metro train running on the outer loop and PF lights on the platform wall and over the platform door. Some images of the station, which was part of a bigger display of Islands Brygge, a central neighborhood in Copenhagen: After moderation, more pictures can be found here. The station is modelled very closely after my local metro station, though I have reduced the number of opening doors to three sets. Here are some reference pictures: I am looking forward to your comments. Esben