I've not tried it, but I reckon there could be an advantage in having an invisible loco, provided it is totally invisible in Driver.
When you move out of the cab you can move huge distances in all three dimensions.
If you look back on the original loco, on all of the one I've tried, it will be disjointed - minus bogies etc. Not a good look if it's included in the shot you want containing "intact" locos.