Train manual move show outline of train

In order to better visualize how much space a train composition takes, my suggestion is to change how manual move works: when you're hovering over the rail with the manual move tool active, show the colored squares that's usually shown under the train when its stationary. By moving the mouse you can see how much space it will take and know if your stacker is long enough, or if the distance between two intersections is enough for a train to stop in between.