You can see a demo of this 'pantograph' here: (https://www.youtube.com/watch?v=-B0-BkWWilg) This is a trap door that will allow you to chose between low-level and high-level platforms. It is scripted as a pantograph, so pressing the 'pantograph' button will cause one side to lower and the other side to rise, depending on which side of the car is being used for the low-level platform. If both 'pantographs' are raised, all trap doors will be lowered for high-level platforms. This will only work if the car has two pantograph attachments for 'a.pant0' and 'a.pant1.' The 'Y' side of the attachment point needs to face the '+y' or '-y' side of the traincar and it is at about the center of the traincar. These are not part of the door animations, so they can be opperated independantly. Of course, you can use the a.i. command 'paantograph state' to make the drivers raise and lower the platforms.