The Attachment Editor is an in-game interactive Map Display with which individual carts of a train can be customized.
This menu is used to configure the appearance and behavior of carts, with a tree layout
showing the different attachments. Each attachment represents a part of the train, such as a moving entity or a seat designation.
Attachments added as a child to other attachments are positioned relative to the parent. This allows many attachments to be moved
and animated together as one larger attachment.