Will's homebrew bs

You Shout "All aboard" and a ethereal train summons and drives 100 ft in a 10 ft wide straight line dealing 3d10 lightning damage and 3d10 force damage to all creatures in its path pushing them prone. They must make a dexterity saving throw Equal to your spellcasting Dc or half as much on a successful save and doesn't fall prone. You can also ride this train without expending movement and get off at any point during the dash.