The Mermaid train will be the shortest of the train styles, apart from not having a train at all. It barely "brushes" the ground behind your dress, adding a modest quantity of volume to the back of your dress. The Mermaid train is the most versatile train because it can be worn at just about all varieties of ceremonies, from a spring garden wedding, to an evening event in the fall. The Mermaid train can show your sexy body.