It's not clearly visible, but I only put an MT on the back because I have the Kato business car that can be tacked on to the end of the train as part of my operating scheme. That has to be uncoupled and dropped, hence the MT.
So, you can add this door and some parts to the master list of Kato parts really useful in many places that you just can't buy.
2-8-2 tender trucks
Kato NW2 offset gearbox assembly
Drumhead door, insert, glass, and red fiber optic...
and probably lots more of your own picking.