Executioner from Hell (Anime)

The Titan guillotine (巨人の処刑台) is a large device invented for the purpose of killing Titans without the need for soldiers fighting them or the use of cannons and other resources.

Design
It is comprised of two parallel Walls grafted onto the outside of the gate with bars between them to prevent Titans from slipping in. There is a large pulley system with chains fixed atop the Walls that includes a large, heavy log with metal covered sides that rests on top of the Wall.

Lost in the cruel world
The Titan guillotine can be seen killing Titans in Trost District.