Adds equipment grids to vehicles in a sensible manner (no more exoskeleton legs in cars or trains or boats or planes), and adds a replacement vehicle specific speed booster equipment. Compatible with SE Space Trains, Fusion Trains, Flamethrower Wagon, Aircraft, AAI Vehicles, Cargo Ships, GunEquipment, Radar Equipment (and more!)
Small changes concerning balance, gameplay, or graphics.
By "train engines", I assume you mean locomotives? If so, then yes, they do actually support equipment grids, though it's a little hard to find.
When you click on the train entity itself and get the view which shows the map and list of train stops, you can switch to the Fuel tab, which has the equipment grid to the side of the the fuel slot window. See example below:
